No strategy group but MD61 is possible

Hi everyone,

I have two materials both are without a strategy group on the MRP3 tab in the material management.

On the first material I can created planned independent requirement using MD61 while on the second material I get an error saying that a strategy group is not present.

How is it possible to create planned independent requirement on the first material when there is no strategy group? Is it possible to define the strategy group for a material elsewhere?