PO doesn't get created, backend returns PO number with "S" message

Hi experts,

I need your kind assisstance with the following problem: when SC is sent to the backend, the backend system returns the PO number with a message that the PO has been created. When we check at the backend the PO is not created.... It happens only when customer fields are transfered in the table EXTENSIONIN.

SRM Server 500.

Thanks a lot for your help.

Tomas Kraus