Material document data and PO data do not match (&1)

What causes this issue?

When you entered a goods movement, the system found that the data in
the purchase order is different from the data in the material document.
Field affected: <LS>&V1&</>
Possible causes:
The purchase order has been changed in the meantime. In this case,
enter the movement again. The system will copy the new data from the
purchase order.
The function module MB_CREATE_GOODS_MOVEMENT was called up incorrectly.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.