Currency code shouldn't be defaulted to BPA document setup when change supplier site

Summary:

Currency code shouldn't be defaulted to BPA document type setup when changing the supplier site

Content (required):

When we copy the BPA & change the supplier site then the currency code automatically defaulted to document type currency code however we want to continue with the existing currency code of old BPA or user should decide which currency need to be applied for the BPA. So overall we want to restrict the BPA to not be defaulted with currency code of document type.

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