STEP 1 : Go to T Code MMNR and then click on change Group

STEP 2 : Click on Create Group

STEP 3 : Provide a Group Name, Number Range Interval and Tick External

STEP 4: Press Ctrl + F to search Material Type FERT

STEP 5: Select the Material Type FERT and Click on Assign Element to Group

STEP 6 : Select Number Range A1 and Press Enter > SAVE.

Thanks,

Adharsh K S