Sufficient stock but MRP create planned order and purchase requisition .

Hi Expert,

After MRP run planned order and purchase requisition created . but the problem is for child material sufficient is there but still PR and plnd order is created .

MRP type PD, LOT size EX,Strategy group 10, for testing purpose I made safety stock 0, min lot size 0 , max lot size 0.

I cant find the cause why MRP create PR and Pland order for the material which has sufficient stock. Please help.