Diagnosis
You are using the Replication Object Wizard of the CRM MiddlewareAdministration Console to create a new replication object. The selectedinterlinkage criteria field cannot be accepted, because it is of wrongtype or length.

Procedure
Open the BDoc Modeler and select the BDoc type for which thereplication object should be created. Select the segment and view thedetails for the field which should be used as interlinkage criteriafield. If the ABAP data type of this field is not RAW of length 16 orCHAR of length 32, this field cannot be used as interlinkage criteriafield.
Only fields of type RAW of length 16 or CHAR of length 32 can be usedas interlinkage criteria fields.