SAP Note 19232 - Line item - Actual: Totaling according to partner

Symptom:

Message : The totaling is made according to partner order/partner cost center. The totals screen shows the partner with blanks.
Transactions : KSB1, KOB1, KSB5, CJ74.
Program : SAPMK21A

Cause and prerequisites

The totaling is made with field PRTAU or PRTKO.
The delivery system contains two totals variants that are using these fields. There are no standard variants for the fields given below.

Solution
Use the fields PRTAU1 and PRTKO1 for the totaling.
You have to define your own totals variants for these fields. Then you must assign these totals variants to your display variants.