How can I setup a default currency on receipt at Net receipt column other than attached with operating unit.

We have not covered foreign currencies in AR.
Here is a quick note:
The Net Receipt amount appears in "functional currency" in which the receipt was entered. The defaulting logic does not affect this field, specially when you select receipt method or the primary bank account (Attached to the receipt method).
Please note that the forum policies are being enforced due to the high volume of inquiries. Only those topics will be answered that are already covered in the videos. Thanks.