You want to know how the currency of purchase order that is created from Purchase request is determined.
SAP Business ByDesign
When we create a Purchase Order from Purchase request items, the header currency of Purchase order is copied from header currency of Purchase Request.
Logic of determining Purchase request header currency is given below:
The Purchase request's header currency gets copied from Purchase request's 1st line item currency. That is whatever currency is maintained for 1st item the same will
become Purchase request's header currency.
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