wrong sum using variable

[atarrqis]

Oracle and CR11.5
I have Group 2=Tran_ID & Group 1=Part. I take the maximum quantity by Trans_ID in GF2. I want to sum these by Part.
I have 3 formulas:
SumPart in GF2
WhilePrintingRecords;
numbervar MP := MP + Maximum ({PROJ \\.QUANTITY}, {PROJ \\.TRANS_ID});

DisplayPart in GF1
WhilePrintingRecords;
numbervar MP;

ResetPart in GH1
whileprintingrecords;
numbervar MP;
if not inrepeatedgroupheader then
MP := 0;

MP in GF1 acts as if it adds the last line twice so the sum is incorrect. I must have something in the wrong place but can’t see it.

 

[atarrqis]

I think I figured our my problem. I was not reseting properly. Thanks anyway.