Receipt date is getting updated with 'Expected Receipt date' Mentioned in ASN by supplier

Supplier Creates ASN with 'Expected Receipt Date'. When we create receipt, we enter the actual date of receipt at  RCV_SHIPMENT_HEADERS, as soon as we save the receipt, the receipt date is getting updated with 'Expected Receipt Date' mentioned in ASN.

How can we restrict the same?

We can have actual receipt creation date at RCV_TRANSACTION, but expectation is to have that at RCV_SHIPMENT_HEADERS.

Thanks.