SAP Message >1037 - Negative postings not allowed for company code &1 and doc. type &2

Diagnosis
Negative postings are not allowed in company code &V1& and/or fordocument type &V2&.

Procedure
If you want to allow negative postings, then specify this inCustomizing.
INCLUDE FICA_NA_CUST_2 OBJECT DOKU ID TX
For company code &V1& and document type &V2& set the NegativePostings Permitted indicator.