I want to restrict EFF Values based on Business Unit selected on Order Header

Summary:

I have Opened an EFF on Sales Order Header which consist of table value set of supplier sites but I want to restrict these sites based on the Business Unit selected on Order Header.

Content (please ensure you mask any confidential information):

Providing Value Set details below.
From Clause
HZ_PARTIES H,POZ_SUPPLIERS PS,POZ_SUPPLIER_SITES_ALL_M P,FUN_ALL_BUSINESS_UNITS_V BU

Value Column Name
H.PARTY_UNIQUE_NAME

Description Column name
BU.BU_NAME

ID Column Name
P.VENDOR_SITE_ID

Where Clause
H.PARTY_ID=PS.PARTY_ID
AND PS.VENDOR_ID=P.VENDOR_ID