Adding Custom fields to SRM Item Data tab & Account Assignment Tab

Hi Everyone,

We have got a small requirement to add 2 custom fields in SRM Shopping cart.

1. Need to add a input field, which should act just like Requisitioner in ECC. ( F4 help ).This will allow to create shopping cart on behalf of some one.
2. Need to add input field, which resembles Goods Recipient in ECC ( Free text)

After adding custom fields, how do i ensure that, it's mapped to right field in ECC.I spent much browsing SRM forum, but couldn't gather much information. I understood that, this involves configuration in SPRO.

Any information or help in any kind would be really helpful.

Thanks in advance.

Vishnu