Rules for Calling Error

Your TP can call Error_Extract only:

For LU 6.2 TP conversation services and CPI Communications TP conversation calls (for a list of supported services, see Overview of Error_Extract Service)
For the most recently completed call to a conversation service (Error_Extract cannot return information for previous calls)
For a conversation that was accepted or allocated by a TP that shares the same home address space as the caller.

When an error return code is returned to an APPC callable service, APPC/MVS retains the information that Error_Extract returns until one of the following occurs:

Your TP calls the Error_Extract service
The conversation is deallocated normally (the TP receives deallocated_normal return code)
Your TP calls another APPC/MVS TP conversation service for the same conversation
The APPC address space is cancelled or restarted.

You should design your TP so APPC/MVS retains the information that Error_Extract returns for as long as it is required.

Recommendation: Do not call another APPC/MVS service after receiving an error return code without first calling Error_Extract.