Deactivation of Pricing Conditions at header level of Sales Order

Hello there,

We have used a routine in pricing procedure (BaseType Routine) to deactivate condition MWST in the MWST condition line in pricing procedure, transaction V/08.

In the routine, We played with the KINAK (set to K )and KOBLI (set to space) flags of structure KOMT1 and XKOMV and delete the MWST entry in the TOBLI table and succeeded to deactivate the MWST at item level of the sales order. (MWST condition appear in the conditions tab at item level as inactive)

We have created a sales order with only one item that has the MWST condition deactivated at item level.

But in the conditions at header level the MWST condition does not appear. Shouldn't the MWST condition appear at header level but deactivated (with a yellow triangle next to MWST)?

If yes is there a flag that we forgot to set?