Need to group shippable and bill only line to invoice and auto pause release once lines shipped

We have scenario where shippable, Bill only lines (Shippable flag is Y for both the items )will be in a single sale order and they are invoice grouping to bill together. so once order is submitted bill only line is placing pause status and Buy line went to awaiting shipping status, once line is shipped then both line should release the pause automatically and should go for awaiting billing status.

but with attached pause rule condition , auto pause release is happening only for Bill only line and its happening for Buy which is stuck in Shipped status.

FileInvoice grouping for bill together.txtUploaded 1:26 pm1.84 KB