Visa stamp for engineering diploma

Hi,

I got offer via Contractor company to work for Aramco. My visa (invitation) status is project management manager but my diploma is engineer diploma. My HR says you can get visa stamp for project management manager position with your engineering diploma but my agency in my country says you have to prove that you are a project manager.

There is any one that get visa stamp with Engineering Diploma for position project management manager position.

Thanks for your help.