Unable to check'relevant for delivery' for 'Standard' Item type in Item cat

Hi

I am facing a strange situation in SAP when I tried to create a new

Item category with Item type as 'Standard' & 'Relevant for Delivery',I

am getting a message that 'Relevant for Delivery'is possible only with

Value Item & Text Item...We have an other Item category in the system

which is of Item Type 'Standard' & 'Relevant for Delivery'..We could

create that Item category without any issues..Could you please let me know

why system is behaving differently when we have same combinations( Item

type as 'Standard' & 'Relevant for Delivery'.)

Regards

Prasad