Message SAP VT589 - '+' or '-' only allowed in connection with completion rule for item cat.

Diagnosis
By making this setting for the 'Quantity/Value pos./neg.' field, youwant the completed quantity / completed value of the source document tobe stored as soon as you copy the source document into a subsequentdocument. However, you must specify at what point of time the sourcedocument is to be regarded as completed.

Procedure
Set the 'Quantity/Value pos./neg.' indicator to its initial value forthe time being and save the settings.
Specify a completion rule for Item category &V1&.
Go back to the settings for copy control and set the 'Quantity/Valuepos./neg.' indicator to the desired value.