SAP Message /SAPPCE/01103 - Document &1 is connected to DP Chain (no accounting document generated)

Diagnosis
You want to release a billing document that is relevant for the downpayment chain (DPC) from application component Sales andDistribution, SD to Financial Accounting (FI).

System Response
This activity is not allowed.

Procedure
You can release these billing documents to FI using transaction
Release Billing Documents to DPC.