Link to proposal/opportunity in workflow notification mail

Hi there,

I have created a bunch of workflows for proposals and opportunities. Mostly around due dates, overdue situations etc. My users receive a notification mail with some info about the affected proposal/opportunity as well as out sales backoffice. Works well. What I would like to add is a link to the respective proposal/opportunity in the email, so that people would only have to click on a link in the mail and get straight to the proposal/opportunity in suiteCRM. Such a link field however doesn’t seem to be part of the module where I manage those email notification templates. The documents module however does seem to have such a function built in. How can I implement such a funtion for proposals or opportunities, too?