SAP Message RE012 - Reduction not possible; doc &1 has a doc cat. (&2) that is not allowed

Diagnosis
You refer to the earmarked funds &V1& with document type &V2& in thisdocument. This is not allowed. Earmarked funds with document type &V2&cannot be reduced by certain documents (for example, FI documents).Earmarked funds with document type 002 (funds transfers) and 020 (fundsblocking) cannot be reduced at all.

Procedure
Choose a different earmarked fund.
You can adjust the system response for the reduction using FI documentswith Business Add-In Determine Document Types Allowed for Reduction
(FMFR_ALLOC_DOCCATS) (however not for funds transfers). In thestandard system, FI and MM invoices can only reduce earmarked funds ofdocument type 030 (funds reservation), 050 (funds commitment) and 060(estimated revenues).
Reduction through other transactions, for example, purchasing documentsand earmarked funds, is fixed. For example, funds precommitments canonly reduce funds reservations.