Whether the money in the pension scheme is halal 3753766754

Assalamu Alaikum wa Rahmatullah. I was working in BADC (Bangladesh Agricultural Development Corporation). Currently retired. Although BADC is a corporation, all activities including salaries and allowances are conducted following the provisions of the government officer / employee. Following the national pay scale, salaries, allowances and retirement benefits are provided. However, retirement pensions and gratuities are paid to government officials / employees and BADC officials are not paid pensions like government officials. Gratuity and Provident benefits are provided to the officers / employees of BADC. So, I want to know whether the money received from the gratuity / provident fund can be kept in the pension scheme (savings certificate) or not? The advantage of the pension scheme is that if a deposit of Rs. 50 lakhs is made, Rs. 50,000 is paid every three months and the principal amount remains intact. It is to be noted that only national scale officers / employees of the government can invest money in the pension scheme (savings certificate). 3121253259