You cannot do this by standard, but you can customize that and this is a possible.
When you make invoice, you need to transfer next fields from Job Planning Line to Sales Line:
-Job. No.
-Job Task No.
-Job Contract Entry No.
Also, you need to fill next fields in Job Planning Line:
-Transferred = YES
-Invoice Type = Invoice
-Invoice No. = No. of sales invoice
-Transferred Date = Invoice Date
You need to add these functionalities when you create Sales Invoice. If you have all of these, you can post invoice and you can get two or more ledger entries with different Job No.