Transfer command is not working

[nus-pe-bot]

Switched to the other wallet with no balance, managed to transfer and received negative balance

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_{[original: nus-cs2113-AY2223S1/pe-interim#1003] [original labels: severity.High type.FunctionalityBug]}

[AmethystQ]

Team's Response

We've discussed about whether negative values should be allowed in the program. On one hand, negative values represent you are in dept. On the other hand, it is sometimes confusing since some users don't expect that they have debts. I think it's better to give a prompt to ask users whether they accept negative values.

Duplicate status (if any):

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