Business Visa and Employment Visa

Hi there ,
How are you guys?
My current firm at Saudi Arabia had issued recently a Qatar Business Visa to manage their business temporarily there within one month only .. On the other side, I received a Job offer from another organization there and they will provide me a Qatar Permanent Employment visa upon signing their offer .
Now, my question .. Is it must to request to cancel this Business visa or use it even by entering Qatar for few days prior to issuing the employment visa OR i can enter Qatar with this Permanent employment visa even at presence also of the Business visa ??
Kindly advise me and share your opinion.
Thanks a lot acchaba, I will do !
I don't think you can have two different visas at the same time for a country. It is better you check with the Qatar embassy in S Arabia or ask your mandoob there to find out for you.