Comparison of Header and Line Items

hi,

i have a tag <ShipTo> in the header as well as in the Line Items.

Scenario:

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1. I am using ZIDOC = ORDERS05 + Extra field "Ship To Site"

This "Ship To Site" code can vary from line item to line item or can be the same for a particular PO.

So Lets say in a PO there are 3 line Items and all the 3 line items can have the "Ship To Site" as "ABCDEF" or "ABCDEF", "EFGHIJ","KLMNOP".

Client's Requirements:

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Based on the values of the "Ship To Site" code in the line items i have to correspondingly map the header <ShipTo> or line item <ShipTo> address details.

Business Rule:

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1. If values of all the 3 "Ship To Site" are equal then take the "Ship To" address details and map it to the header <Ship To> address details.

2. Else if all the 3 values are different then leave the header <ShipTo> and fill the line items <ShipTo>

Can we achieve this logic using Graphical Mapping tool?

Thanks,

Tirumal