Down payment must be posted as a special general ledger transaction

What causes this issue?

You are using a transaction type for down payments.
However, the posting item does <ZH>not</> contain any special G/L
indicator for down payments.

System Response

The transaction can<ZH>not</> be posted.

How to fix this error?

Post down payments or down payment clearings with asset reference only
as special G/L transactions on the credit side. Use the transaction
intended for this.
<LS>Down payment request</> (<AB>F-47</>) / <LS>Post Vendor Payment</>
(<AB>F-48</>) or <LS>Write Off Vendor Payment</> (<AB>F-54</>).

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.