Can't map a Decimal Source Field to a Number (Decimal) Record Field Type

Hi everyone. I added a new Decimal field to one of my DB tables, but when I try to map this source field to the corresponding record field in Appian the Number (Decimal) type is not available in the dropdown (please see the screenshot below). Does anyone know what could be the reason for that? Even Appian recognizes the source field as Decimal, but still doesn't give me a proper option in the choice list. I would appreciate any advice on this matter. Thank you.

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