Sales order - Item Doc Currency different from Header

Hi,

Issue:

a. Customer has currency USD in CM

b. In the sales order VA01, the Header Document currency is correctly copied as USD.

c. When the user tries to change it to the 'local' currency  INR in the Header (VBAK-WAERK), few items (VBAP-WAERK) are getting changed as 'INR' but few items 'still remain' as USD (even after the header doc currency is changed to INR).

We have found a workaround with changing of the header doc currency in VA02 & saving the sales order again. This makes the all the 'items' consistent with the header level doc currency.

But, the business wants to 'fix' this issue as why the 'item level doc currency (VBAP-WAERK)' is different from the 'header level doc currency' (VBAK-WAERK), while sales order creation.

Thanks for your help.

Best Rgds

Narain