SAP Errors Catalog Part 4: Complete Guide to IDoc, ALE & RFC Communication Errors

SAP Errors Catalog - Part 4: Integration, IDoc & RFC

Comprehensive guide to IDoc processing status errors (WE02/BD87), RFC connection failures (SM59), transactional RFC queue issues (SM58), and Partner Profile misconfigurations (WE20).

1. IDoc Inbound & Outbound Processing Statuses (WE02 / BD87)

STATUS 51

IDoc Status 51 - Application Document Not Posted

The IDoc was successfully received by the target SAP system, but the application posting function module failed due to missing functional configuration, locked objects, or invalid data values.

Resolution

Inspect error message details in WE02 / BD87. Correct the underlying data or configuration (e.g., missing GL accounts, locked materials) and reprocess via BD87.

STATUS 29

IDoc Status 29 - Error in EDI Syntax / Partner Profile Not Found

Outbound IDoc processing failed because no matching outbound partner profile, port, or message type configuration exists for the receiver partner.

Resolution

Maintain outbound partner parameters, port assignment, and message type in Transaction WE20.

STATUS 56

IDoc Status 56 - IDoc Number Assignment Error / Control Record Error

Inbound IDoc contains corrupt control record details (e.g., invalid message type, missing SAP IDoc type definition, or bad partner number).

Resolution

Check IDoc basic type definitions in WE30 and inbound partner profile setup in WE20.

STATUS 60

IDoc Status 60 - Error During Syntax Check

The IDoc segment structure violates segment hierarchy definitions, mandatory field checks, or data length specifications.

STATUS 64

IDoc Status 64 - IDoc Ready to be Transferred to Application

IDoc is waiting in queue to be processed (occurs when partner profile is set to "Trigger by background program"). Process manually or schedule report RBDAPP01.

2. RFC Destination & Communication Errors (SM59)

RFC ERROR

RFC Communication Failure / CPIC Error (LOCATION CPIC-Call)

The SAP system failed to establish a network socket connection with the remote RFC server host (host unreachable, wrong IP/hostname, or port blocked).

Resolution

Execute **Connection Test** in SM59. Verify gateway host settings, subnet routing, and TCP port openness (port `33xx` / `48xx`).

RFC ERROR

RFC Logon Failure / USER_LOCKED or Client Mismatch

RFC connection failed during the authentication phase because the service user account is locked, password expired, or client number is incorrect.

Resolution

Execute **Authorization Test** in SM59. Unlock the RFC background user in SU01 and update stored logon credentials in SM59.

RFC ERROR

SYSTEM_FAILURE during RFC Execution

An uncaught exception or ABAP short dump occurred on the target remote system during function execution.

3. Transactional & Queued RFC Execution (SM58 / SMQ1 / SMQ2)

tRFC / qRFC

Transaction Executed with Error in Target System (SM58)

A transactional RFC call failed to commit on the target system due to application errors, system shutdown, or database rollback.

Resolution

Review tRFC status in Transaction SM58. Select the failed LUW (Logical Unit of Work) and choose **Execute LUW** to re-trigger execution.

qRFC

qRFC Queue Blocked (SYSFAIL Status in SMQ1 / SMQ2)

An outbound (`SMQ1`) or inbound (`SMQ2`) queued RFC queue entered a `SYSFAIL` state due to a stuck entry, preventing subsequent entries in the queue from executing.

Resolution

Identify the root cause of the top entry in SMQ1 / SMQ2, resolve the error, and choose **Activate Queue**.

4. ALE Distribution Model & Port Mappings (BD64 / WE21)

ALE

Model View Does Not Exist / Filtered IDoc

An outbound IDoc was not created because no active ALE Distribution Model filter matches the source message type or data criteria.

Resolution

Maintain and distribute the ALE distribution model in Transaction BD64.

PORT

Port Cannot Be Opened (WE21 TRFC / tRFC Port Error)

The IDoc port assigned to the partner profile refers to an invalid or missing RFC destination in SM59.