Pricing Redetermination when custom field changes ON Additioanl data B Tab

Hi All Experts,

I have added new custom field(ZZ_STCEG, ZZ_ASTCEG and ZZ_MSTCEG) on Addititonal data Tab B. Before that i added those fields in KOMP(ZZ_STCEG) and VBAP(ZZ_STCEG, ZZ_ASTCEG and ZZ_MSTCEG).

I have a function module which gives output EX_STCEG.

Now i need to assign the ZZ_STCEG to ZZ_ASTCEG as it is determined by system. If i enter value in Manual field(ZZ_MSTCEG) this should be used for pricing and also assign it to ZZ_STCEG. (Note: But ZZ_ASTCEG should not be changed as it is automatically determined beforre.)

I have programmed in UserExit_Pricing_Prepare_TKOMP as below.

Call to function module(output ex_stceg)

vbap-zz_astceg = ex_Stceg.

if vbap-zz_mstceg is not initial.

vbap-zz_stceg = vbap-zz_mstceg.

tkomp-zz_stceg = vbap-zz_mstceg.

else.

vbap-zz_stceg = vbap-ex_stceg.

tkomp-zz_stceg = vbap-ex_stceg.

endif.

But it is not working as intended. I think because Vbap_zz_Mstceg doesnot have value during pricing because we fill it after the pricing in additional data tab B.

Please suggest me how to proceed with this situation.

Thanks & regards,

NarsiReddy.