how to activate a pricing condition

Hi Gurus,

We have a sales order where the pricing conditions are shown inactive at item level. Hence there is net price appearing at item level, but the net price is not shown at the header level.

This is an issue because when invoice is created, it is getting created with value = 0.

We tried updating pricing at both header and item levels with pricing type - C, but of no use.

Request your help in letting us know how to activate the pricing conditions, so that the value appears at the header level.

Thank you in advance,

Krishan