BAI2 file format- 4 record

Hello SAP Guru's-

In testing the lockbox functionality, I have a client who has a customer that remits with over several hundred line items in one check. In the 4 record, the bank sent me a file with the following format

Record Type 4

Batch Number 001

Item Number 001

Overflow Type 4

Overflow Seq Nbr 01 to 99 then start 01 again

Last Ovfl Flag 9 (on last record)

On the Overflow Sequence number, when they got to 99 they started over to 01 on the next line item. Is this correct? I understood that they should change the overflow type from a 4 to a 6 and restart with a new 4 record?

Please help!

I will AWARD POINTS.

Many thanks!