If you check the plugin code you will see the mask is applied on page load from the given setting, so your change won't affect things at runtime.
thank you for answering, it's working!
when i want to insert a new row and to that purpose change the input mask from its default value (by selecting a checkbox item), then i get the error message
"Session state protection violation: This may be caused by manual alteration of protected page item P2_INPUTMASK. If you are unsure what caused this error, please contact the application administrator for assistance."
It seems that i hit a already known issue: https://forums.oracle.com/thread/2488254 . A workaround is described in https://forums.oracle.com/message/10770001#10770001.
Initially the item P2_INPUTMASK was of display type "Hidden". Changing this to "Display Only" has resolved the issue. Now i'm looking for a smart way to hide the item.
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If there is no security concern, you could change it to Hidden, with Value Protected = No.
Thank you very much indeed!