VPK1050 - There is more than one sales pricing for these sales document items

SAP Error Message - Details

• Message type: E = Error

• Message class: VPK1 - SPC Processor Messages

• Message number: 050

• Message text: There is more than one sales pricing for these sales document items

What causes this issue?

The selected sales and distribution document items were billed in
different resource-related billing requests. The system cannot process
them together.

System Response

INCLUDE NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX

How to fix this error?

INCLUDE NA_ALLG_MOEGLICH OBJECT DOKU ID TX
In the initial screen, enter only sales document items which can be
processed together.
Delete the interim storage for the items you want to bill on a
resource-related basis.

Error message extract from SAP system. Copyright SAP SE.