Tax code is not changing in back-end

Hi All SRM Tecnical/ Functional consultants ,

i am working <b>In SRM5.0 Ver in classic scenario:</b>

<b>Present:</b> If i change the tax code in the shopping cart from the default tax code. Only default tax code is moving to bac-end purchase order.

<b>Required:</b> What i need is by changing the tax code in shopping cart from default , the changed (new)tax code should reflect in back-endconcened purchase order.

i got the new tax code using the function module <b>BBP_PD_SC_ITEM_GETDETAIL</b> . in the tables E_TAX we can get the new tax code. How can i pass this new tax code to back-end Purchase order ?

Can you please suggest what iHo can i do?

Regards

Badari Talanki