Copying PO# and PO Date from Inquiry to Quotation or from Quotation to Sales Order

This is the standard SAP functionality in the copy controls which is restricting to copy PO# and PO Date from Inquiry to Quotation or from Quotation to Sales Order.
Data Transfer Routine "101" is used as Header Business Data to copy informtaion from Inquiry to Quotation or from Quotation to Sales Order
Routine 101 is clearing all the data before copying it to target documnet.
You can find the code in routine 101 as seen under
* PO data should not be copied
CLEAR: VBKD-BSTKD,
VBKD-BSTDK,
VBKD-BSARK,
VBKD-IHREZ,
VBKD-BSTKD_E,
VBKD-BSTDK_E,
VBKD-BSARK_E,
VBKD-IHREZ_E,
VBKD-POSEX_E.

If your requirement is to copy PO# and PO date automatically copy the routine 101 and remove the code CLEAR and allow the system to copy the desired data