SAP Message UPS161 - A change function is stipulated for objects in corrections

Diagnosis
A change function has not been specified for each object.
A correction package carries out changes to the object list of adistribution unit. The type of change is specified in the form of achange function. You can choose from:
,,I: Insertion of a new object
,,U: Update (= send again) of an object
,,D: Removal of an object from the object list (deletion record iswritten)
,,X: Deletion of an object from the list

System Response
The changes to the correction package are not posted.

Procedure
Ensure that a change function is entered for each object in the changepackage.