No balance load for & STO delivery with one step procedure

What causes this issue?

A delivery with reference to a stock transfer order has been marked as
relevant for load and discharge. The movement beween the concerned
plants has been costomised as a one step procedure. That means the
goods issue from the sending plant and the goods receipt to the
available stock in the receiving plant are posted together in one
material document. TD customising requires balance load for the
concerned shipment type .

System Response

The system does not carry out balance load for the quantities related
to the delivery.

How to fix this error?

Omit balance load and only specify the discharge quantities in delivery
confirmation.

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.