Suggestion:
System has the provision for creating Purchase quotation after saving the Purchase enquiry.
For Quotation screen go to SCM->Purchase -> Quotation
To create quotation, User needs to select the fresh confirmed enquiry number. Once the enquiry number is entered, all the details gets populated. User has to give validity date in the header. User has to enter the line no, qty, rate and save the record.
System has a seperate process screen for quotation approval. User can approve the record using the same.