Line wise Application of Deposit on Invoice Oracle R12

hi every one,

can any body suggest me how can we apply deposit line wise on invoice.

Example:

we have an invoice of Amount 1000 in AR module which comprise of three different Revenue Account.

Medical Billing ---500

Transcription -----250

Indexing       ------250

Invoice Accounting is as  given below:

AR-----DR_____1000

Medical Billing_____CR ---500

Transcription______CR -----250

Indexing      _______CR ------250

NOW:

we want to Apply deposit whose Account is as follows

Accruals ____DR with Account Receivable Account

Receivable ____CR with Account Receivable Account

Now we want to apply deposit to only one line of above given invoice which is medical billing which for we have this deposit.