Formula Only works when click Update Pricing

I've created a condition formula that changes KOMK-TXJCD. It only works when I click Updat on the condition screen. But just saving does not use the new TXJCD that I assigned from the plant in the alternate formula. In debug I see the values changing. Here is a copy of the code.

Any help MUCH rewarded.

Data lv_titlepass(1) type c.

DATA wa_plant_txjcd like t001w-txjcd .

• start by assuming default .

lv_titlepass = 'D' .

• now look at incoterm field

CASE KOMP-OITITLE.

WHEN '1'.

lv_titlepass = 'D'.

WHEN OTHERS.

lv_titlepass = 'O'.

ENDCASE.

• the default is tax is charged using destination txjcd.

• If 'O' then change TXJCD

• use the plant

If lv_titlepass = 'O' .

clear wa_plant_txjcd .

select single txjcd from t001w into wa_plant_txjcd

where werks = komp-werks .

If sy-subrc <> 0 .

exit .

else.

KOMK-txjcd = wa_plant_txjcd .

endif .

Endif .