Will a record with incomplete mandatory fields be saved if created or updated by delute script?

Will a record with incomplete mandatory fields be saved if created or updated by delute script?

I am trying to modfy some  existing code in an application to add two more fields to a function for updating a record from another or create a new record. However I have found that the record that is being written to or created (destination) has three fields that are mandatory whilst the record used to supply the data (source) does not have these three fields mandatory. So my question is, will I be able to save  the record if any of the mandatory fields on the destination form are incomplete.