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AR991P RPG36

Process Steps of the RPG Program AR991P

This RPG program (likely RPG III for IBM midrange systems like AS/400) is designed to generate and retrieve a unique override code for Accounts Receivable (A/R) processes. It interacts with a display file for user prompting/output and a disk file for data storage/retrieval. The program is invoked from the OCL script (as per the previous context), which loads and runs it with parameter-driven file access.

Below is a step-by-step breakdown of the program's execution flow based on the source code:

  1. Program Initialization (Header and File Setup):
    The program starts with header specifications (H spec) defining the program name (AR991P) and other attributes. File specifications (F specs) declare:
  2. SCREEN: A workstation display file (500 bytes) for interactive input/output with the user (e.g., prompting on a terminal).

  3. GSCONT: An update/full disk file (512-byte records, keyed access with alternate index). This is the primary data file.
    Input specifications (I specs) define record formats, fields (e.g., KYCODE from SCREEN, GCDEL and GXCODE from GSCONT), and a user data structure (UDS) for holding runtime variables like KYJOBQ, KYCOPY, KYCANC, and KYCODE.

  4. Variable Initialization:

  5. Move blanks to the MSG field (40 characters) to clear any message output.

  6. Set off indicators 81-90 to reset control flags.

  7. Indicator-Based Control Check:

  8. If indicator 09 is on (from input or prior logic), set on indicator 81 (likely to enable display or error handling).

  9. If indicator 09 is off:

    • Set on the LR (Last Record) indicator to signal program end.
    • Branch to the END tag, terminating the program early.
      This acts as a conditional entry point, possibly skipping processing if not invoked in a specific mode (e.g., from OCL).

  10. Retrieve System Time and Date:

  11. Capture the current time into TIMEOF (6 digits, HHMMSS format).
  12. Capture the current date and time into TIMDAT (12 digits, likely YYYYMMDDHHMM format).

  13. Extract and manipulate date/time components:

    • Move TIMDAT to SYSTIM (6 digits, time portion).
    • Move TIMDAT to SYSDAT (6 digits, date portion, likely MMDDYY or similar).
    • Multiply SYSDAT by 10000.01 to create SYSYMD (6 digits, possibly shifting to YYMMDD format).
    • Construct SYSDT8 (8 digits) by prefixing '20' (assuming 2000s era, Y2K handling) and appending SYSYMD.
    • Add SYSTIM to SYSDAT to create FLD1 (8 digits).
    • Multiply FLD1 by SYSYMD to create FLD2 (11 digits).
      These manipulations appear to generate a unique numeric value based on the current timestamp, handling potential Y2K issues (e.g., prefixing '20' for century).

  14. Generate Unique KYCODE:

  15. Zero-add FLD2 to KYCODE (6 digits, numeric), effectively truncating or converting the computed value into a 6-digit code.
    This KYCODE serves as a unique identifier or override code for A/R operations, derived from the system date/time to ensure uniqueness and timeliness.

  16. Database Operation on GSCONT:

  17. Chain (keyed read) to the GSCONT file using a dummy key '00' (likely to check for a control record or initialize). Indicator 99 is set if the record is not found.

  18. If not found (N99), execute an EXCPT operation, which outputs a new record to GSCONT (adding the generated KYCODE to position 64 in the record, as per O specs).

  19. Cancellation Handling:

  20. If indicator KG is on (possibly set externally or from prior logic, indicating "key good" or successful generation), set off indicators 01 and 09.

  21. Move 'CANCEL' to KYCANC (6 characters in UDS), potentially signaling cancellation or override status back to the caller.
    This branches to the END tag if triggered.

  22. Output and Termination:

  23. Output to SCREEN: Includes a constant 'AR991PFM' (possibly a format name), the generated KYCODE (positions 1-6), and MSG (positions 7-46, for any message display).
  24. If EXCPT was triggered, output to GSCONT: Writes KYCODE to positions 59-64 (overlapping with GXCODE field).
  25. The program ends at the END tag, with LR indicator controlling final cleanup (e.g., closing files).

The program runs in a single cycle (no loops), focusing on quick code generation and storage. It relies on indicators for flow control, typical of RPG's event-driven style.

Business Rules

The program enforces the following business logic for A/R override code retrieval:

  • Unique Code Generation: The KYCODE is algorithmically derived from the current system date and time, ensuring it's time-bound and unique (e.g., incorporating year, month, day, hour, minute, second via multiplications and additions). This prevents duplicates and ties the code to the generation timestamp, useful for auditing or expiration in A/R overrides (e.g., temporary access or transaction approvals).

  • Y2K Compliance Handling: Prefixing '20' to the date suggests built-in handling for two-digit year formats, converting to a four-digit equivalent to avoid millennium bugs. This implies the system processes dates in a legacy format but ensures forward compatibility.

  • Database Integrity:

  • A dummy chain with '00' checks for an existing control record. If absent, a new record is added via EXCPT, storing the KYCODE. This could initialize or log the override in GSCONT.

  • Fields like GCDEL (position 1, possibly a deletion flag) and GXCODE (positions 59-64, override code storage) suggest GSCONT tracks override codes with status flags.

  • Cancellation/Override Mechanism: Setting KYCANC to 'CANCEL' under certain conditions (KG indicator) allows the program to signal back to the OCL caller (via UDS) that the operation was aborted or overridden, integrating with broader job control.

  • User Interaction: The SCREEN file prompts the user (e.g., for retrieval) and displays the KYCODE and any MSG, enforcing interactive validation in A/R workflows.

  • Error/Conditional Handling: Early exit if indicator 09 is off ensures the program only runs in valid contexts (e.g., not canceled). Indicator 81 enables display if needed, while 99 handles missing records by creating them.

These rules support secure, auditable A/R overrides, common in financial systems to bypass standard controls temporarily (e.g., for credit approvals) while logging actions.

Tables Used

  • GSCONT: A keyed disk file (512-byte records) used for update and retrieval. It stores override data, including:
  • GCDEL (position 1: deletion or status flag).

  • GXCODE (positions 59-64: override code storage).
    KYCODE is used as a key or data field here. This is the primary database table for persisting the generated code.

  • SCREEN: A workstation display file (not a traditional database table but a file for terminal I/O). It handles input (e.g., KYCODE from user) and output (e.g., displaying KYCODE and MSG). Fields include KYCODE (positions 3-8).

No other tables or files are referenced.

External Programs Called

None. The program does not use CALL opcodes or any other mechanisms to invoke external programs. All logic is self-contained, with the OCL script serving as the external caller to load and run this RPG program.