Is there a way to add a default value to a hidden field only if the field is blank in the database? So if the person is a known record, the hidden field should get the default value only if it didn’t have a recorded value initially. If there was a recorded value initially, it should not be overwritten by the default value.
Well, if this is the requirement for all the forms using this field, then you can block field updates from being filled out (Marketo Admin > Field Management > Select Field > Field Actions > Block Updates From). The idea is to let this field be populated once and never again.
Also, if you want the update to be blocked from other sources too (other than form fill, then you can select more input sources too). You might want to allow the Change Data Value flow step to update the field, as it may be an intentional way to change the value when other methods are blocked.
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