Attempt to change read-only field 'Header Discount'. when I did not even set the HDRDISC value

Hi, I encounter this odd behavior while creating a macro to do an OE Invoice Entry. I did not even set the "HDRDISC" value but this error 1144

"Invoice Detail

Attempt to change read-only field 'Header Discount'."

keep popping up and I am not able to post my invoice because of it. Anyone can help me why is this happening? Thank you.

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