Query on loan staff agreement for ca articleship

Hello friends.. I am selected at a very good firm for Ca articleship based on the condition that I have to work there on a loan staff agreement due to lack of vacancy(means I have to register myself with someother CA and then my selection will be finalised.)Also after working there for 3 years I would get a work experience certificate from them. So I want to ask whether working as per this system would affect my future career prospects and any other details that would will help me to work in this system. Thank you.