Enter a price

What causes this issue?

The functionality requires that a price must be entered for service
lines in purchase orders and service entry sheets.

System Response

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

How to fix this error?

If you have to enter a line with the price "0", you can mark the line
as an informatory line.

Error message extract from SAP system. Copyright SAP SE.