Rules for handling data entered for invoice amount and invoice allocations

[lcreid]

No description provided.

[lcreid]

We want validation of all the money fields in the Invoice form:

When the user enters or changes an amount in the "Amount from this Invoice" field, Javascript will ensure that:

1. The amount is less than than the Invoice Amount minus the other allocations for the invoice (this is the maximum allowable for this allocation per the invoice). If not, show a message and reduce the amount to the maximum allowable for this allocation.
2. The amount is less than the the RTP Amount Requested field, minus the allocations against the RTP for other invoices (this is the maximum allowable for this allocation per the RTP. If not, show a message and reduce the amount to the maximum allowable per the RTP.
3. Calculate the new "Amount Available".
4. Calculate "Out of Pocket"

When the user enters or changes the invoice amount, then do the above on all the allocations.

[lcreid]

Decide what to do about messages, if anything, in Issue #78.