"Engineering Product (SP)" of material "XXXXX" does not allow extrnl proc.

Hi Guys,

Will you help me this, I encountered a problem while creating a Purchase Order, the material I used pops up an error message stating that """Status "Engineering Product (SP)" of material "XXXXX" does not allow external procurement""" but some materials I used does not encountered any error. Is there something with that material, if there is, what are the possible reasons why I cant use that material?

Any feedback from you would be a great help.

Thanks and God Bless you all always.

Ato