Having an issue with Planning method A - for purchased finished good.  

Using MS Level 1 - but if I set Min/Max/Multiple lot sizes to anything other than zero, Purchase req’s go away and get MS Supply lines instead.  Also, I am using planning time fence as a surrogate for purchasing lead time, which doesn’t seem to have any functionality. 

How do you specify whether MS1 or MRP is  doing the planning?

This is all in IFS 8 (upgrading to IFS 9 soon I believe).