SAP Message V1522 - Sales order type & is blocked for processing

Diagnosis
A block indicator is set for document type &V1&.

System Response
The system does not allow you to create a document of this documenttype.
INCLUDE 'NA_CHECK_ENTRY' OBJECT DOKU ID TX LANGUAGE EN
If all entries are correct, check whether it is necessary to block thedocument type. To unblock the document type, delete the block indicatorin the document type.
INCLUDE 'NA_CUST_MAINTAIN_3' OBJECT DOKU ID TX LANGUAGE EN