[V14] hr_expense_invoice, bill created without vendor, bill line gone when vendor is added, can create multi line expenses into a vendor bill

[bunhin]

approved

I want to create the two lines into a vendor bill (i see no buttons for this, in the form or in the action menu)
There is a button "create vendor bill" on each line when the button is clicked on each line, 2 separate draft vendor bills are created without a vendor (so it can't be posted), try a vendor in the bill --> the bill line is gone
The expense report can't be posted as well.

To Reproduce

Affected versions: Tried in V14 on runboat

1. Create a petty cash holder
2. Create vendor bill (check petty cash) and register payment to fill the petty cash
3. Create expense 2 expense items product lamp and chair, check paid by petty cash and add the petty cash holder created before
4. create expense report for the 2 expense items created
5. submit to manager
6. Approve the report
7. There is no button to create into one bill (expected is have an option to create multi-line into a bill if vendor for product is the same
8. click "create vendor bill" button on each line --> two draft vendor bills are created without vendor
9. Try add a vendor onto the vendor bill --> the bill line is now gone (should be not gone)

Expected behavior

1. expected there is an option (button) to select and to create expense lines in the report into a bill
2. when there is no vendor on the created draft bill, and then we add a vendor there, the bill line should not be kept there..

Additional context

Is there any config that i miss?

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