Is it possible to use MPA (Multi-Period Accounting) for line types with balance type "Encumbrance"?

Hello,

does anybody know, about MPA (Multi-Period Accounting) usage for line types with balance type "Encumbrance"? We are trying to perform similar setup as indicated in "Subledger Accounting White Paper on Multi Period Accounting (MPA) in R12", but when we try to create "Accrual" line type (for example, based on "(AP_ITEM_EXPENSE_INV_ENC_DR) Encumbrance Item Expense" line type), the only available multiperiod option is none and we are unable to choose "Accrual".

P.S.: "(AP_ITEM_EXPENSE_INV_ENC_DR) Encumbrance Item Expense" line type is located in "Encumbrance for Invoices" journal lines definition.

Thanks in advance.