Change Order: Communication Email changed but not used

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Hi,

I was testing with PO communication and the system had an e-mail defaulted from Supplier Site setup.

It got approved and e-mail sent. No problem so far.

I initiated a Change Order and changed the communication Email to something completely different. I got it approved again but now there's an issue.

The system still takes the initial (Supplier Site) Emailaddress to send the PO, while the Change Order has successfully changed the Emailaddress (as reflected on the PO as well).

Is this a bug or intended behavior? If the Email can/should not be changed, why is this field available for editing?