How to assign multiple authorizations to one expense item?

Summary:

Wen create an expense item and attach the spend authorization, the system only let us to attach one authorization per expense item, we need to know if its possible to attach more than one.

The scenario is when fund reservation is enabled in the spend authorizations, the users cannot submit their expenses if the spend authorization amount is less than the expense item amount, so if we can add another authorization for the missing amount, they would send their expense reports.

e.g.

Authorization amount 250

Expense item amount 260

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