https://userapps.support.sap.com/sap/support/knowledge/en/2682974
2682974 - C4C - ERP Integration - Field KUKLA is Filled With # in DEBMAS IDOC | SAP Knowledge Base...
When receiving DEBMAS idoc from C4C with Customer data, the idoc shows the error "Entry # does not exist in TKUKL (check entry)" in WE02.