Hi Andy,

Use the IS_DECIMAL_IN_RANGE() validator

db.receipt.payment_amount.requires=IS_DECIMAL_IN_RANGE(-1e100, 1e100, 
dot=".")


>From the web2py book:

The minimum and maximum limits can be None, meaning no lower or upper 
limit, respectively.

The dot argument is optional and allows you to internationalize the symbol 
used to separate the decimals.

Kind regards,

Annet

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