Occupation permit

HI ,

I have a doubt one of the requirements for the occupation permit is Original and copy of academic / professional qualifications of the applicant, I have my original diploma and certifications of technical courses, the diploma is from my country of origin but it is not certified, there will be some Possibility of having drawbacks with that?

No doesnt matter. As long as your employer has good reputation they seem not very strictly on the documents.

You need to have your original qualifications with you.  It's either an original OR a certified copy (in the absence of original). Your employer's reputation has nothing to do with all this. This is required as per the official requirements of the BOI, published on their official documents checklist.