Dear all,
on this section is required for those line items:
Confirmed PO Delivery line item
Confirmed Purchase Order Receipt line item
to use the formula OFFSET, but I am not able to manage the proper result using that formula but I was using the formula POST and please refer to the print screen 
The tips on the training is to use OFFSET but I am not able to manage it using that formula, it is this correct using POST?
Thanks in advance and regards
Jose