Associating the correct requisitions to candidates

Summary

Associating requisitions to offers and emails

Content

Good morning,

When sending an email to a candidate using the contact log and clicking on "new email", the email screen that pops up allows a user to select the requisition that the email is regarding. The requisition drop-down list includes the job title and the job code. Is there any way to change the job code from being listed to the requisition ID? Although the "Job Code" field defaults to the "Requisition ID" number, since the job code is an editable field, it may not always match the requisition ID. 

I have the same question on the "Offer Letter Details" section of the "New Offer" page.