Problem linkage between Opportunity & Quotation

Hi Team

Kindly advise what I need to do to linkage between Opportunity and Quotation

I create the Quotation from Opportunity option but after the Quotation is created, all the trail from the Opportunity link is missing

I try to manually link it back between Opportunity and Quotation manually, but the system is not allowed me to do so.

Kindly advise

In the Opportunity, did you select Items? If yes, then in the Quotation Item table, Opportunity ID will be updated. I suggest you trying on cycle with Opportunity with items.