Do you have a value in the field ARCH_LDOCU for your SD_VBAK object in table ARCH_USR?
If the the CREP field in ARCH_USR is empty, then SAP is looking for content repositiories via the document type field
Do you have a value in the field ARCH_LDOCU for your SD_VBAK object in table ARCH_USR?
If the the CREP field in ARCH_USR is empty, then SAP is looking for content repositiories via the document type field