Solution : https://service.sap.com/sap/support/notes/1423413 (SAP Service marketplace login required)
Key words : 
fi-ca transactions fp03l, application fi-ca, call back receivables, terms fp-collag, issue error message >2 105, external collection agencies, missing authorization checks, transactions fp03l, program error, collection items
Related Notes : 
       
| 888889 | Automatic checks for security notes using RSECNOTE |