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When we imported a customize structure Z* which append for table RESB to QAS system, it worked; but imported to PRD system, so many users complained they could not run standard SAP programs, like CO13, CO14, CO15 etc.

Check with ST22, found a lot of ABAP runtime errors, LOAD_TYPE_VERSION_MISMATCH.

Search in service.sap.com, found 2 related notes,

It seams that this causes an memory overflow, and then leads to an error. Based on Note 1010590, the solution was import Support Package SAPKB70012 or higher, or implement the correction instructions. But the copy of PRD, QAS system was not happen the error. So we decided to restart the PRD to try to solve this.

Worked!