change UOM - no stk ,no PO,PR

Hi guys ,

I want to change the Base UOM of a material from NOS to KG , as it was defined wrongly.

The material is just created,hence there is no stk ,no PO,no PR. There is no conversion factor also.

Still the system displays an error "Routings already exist that are assigned to the material."

I cannot define a Alternate UOM as the stk and PO are needed in KG only.

What can be done. how do i change UOM ,pls reply. thanks in advance.

rgds