Hi Kishore,
FBCJC1- Once if we are posting any Cash journal document, two documents will be posted in SAP. One is only in Cash journal & another will be posted in FI module. For cash journal related no. range is maintained in FBCJC1. And this is maintained the intervals under each co.code level here.
FBCJC6 - Specifies a cash document entity that consists of one or more cash documents. A single number range of cash documents is assigned for all cash receipts or payments in a cash journal.Defined numbering groups for incoming / outgoing cash documents in a separate number range else system will assign the numbers in a sequential manner for both incoming/ outgoing cash documents.
Thanks & Regards,
Lakshmi S