Page Item / Source / Format Mask - Table Column Numeric

Form page to maintain a table row, the item is for a numeric column. Selected/Entered the format mask "999G999G999G999G990D00" for the Page Item / Source. I was under the impression that this would result in the page item being formatted with the mask when navigating out of the item. I can enter non-numeric values and navigate out with no error being raised/reported ... is this expected behaviour?
Thanks

APEX was touted at being a MS Access application killer and a RAD tool. If the user is presented with having to understand the complexities of session state variables, page item variables, etc. then a lot of developers/users will be switched off. APEX was supposed to appeal to the masses as the pipes and plumbing coding behind having a web application front end on an Oracle database backend was being hidden. The converse seems to apply when implementing functionality like a format mask being applied both on entry and display of several page items. So I may be able to implement the required format validation using Javascript but if I have to apply this functionality to more than one page item in now way does APEX lend itself to RAD, e.g. In Oracle Forms you could select multiple Block/Items and then change a property to apply to all the selected items.

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