Prohibit change on SOME fields after record is created

in Access 97, can particular fields (not all) on a form be locked so that the data (once entered) cannot be changed.
I tried to lock the field, but upon locking you can't even enter NEW data.

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Creating a new record
I am looking for suggestions on how to code this:

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I have created a basic database for entering surgical data for a medical practice. A picture of the Relationships are attached. When I create a form I get the following message: ""You Cannot Add or Change a Record because a Related Record is Required in tblSurgicalID".

What am I doing wrong here? I have tried everything

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Record the change and playback them as a video
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I mean it is like someone videoing your action for the last 10 minute and play them back.

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When the query is run the result shows only the 2 or 3 records.

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Should I have used a different method to create the Class Calendar form with the Yes/No fields for Registration and Attended?