Required ZPR1 condition type value Updated automatically in the ZPMO

[abulhasnat]

Hi Experts,

We have a header condition type ZPR1 which can aggregate all the items values of TANN, now we are copying that value into ZPMO manually. Our expectation is it will update automatically in the condition type ZPMO. How can we achieve this? Please see the below screenshot:

Thanks 
Abul Hasnat