There is an existing ER BUG 4765613 - INTERNAL REQUISITION TRANSFER CHARGE.
Current R12 Behavior:
Tax
Classification or any tax attributes are not supported in RFQ/Quotation Oracle E-Business Tax User Guide
Release 12.2 Part Number E48751-03 Section - Managing Configuration Owners and Service Providers - Managing Event Class Settings
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This table lists
the event classes that are applicable to E-Business Tax: Application Event
Class Payables Standard
Invoices Payables Prepayment
Invoices Payables Expense
Reports Purchasing
Requisition Purchasing Purchase
Order and Agreement Purchasing Release .....
-- > RFQ/Quotation are not applicable to EBtax.