Is it possible to remove schedule from an archived RFQ(Request for Quotation)?

Dear all,

please advice in this situation:

an old RFQ (Request for Quotation) is showing as a delivery open in the report. We wanted to delete the schedule in this RFQ, but it has already been archived (we cannot change it now!). Please advise whether it is possible in some way to delete the schedule for this archive RFQ? Management should not see this RFQ as "delivery open".

Thank you in advance for your help! I will be glad of any information.

Annet