make row in multiple records form read-only

Is is possible to prevent entry in a row in a “multiple records” form, based on the value of a field in that row?
IE : if ID = 1, user should not be able to change the field in that row.
[TABLE=“border: 0, cellpadding: 0, cellspacing: 0”]
[TR]
[TD]ID [/TD]
[TD] name[/TD]
[TD] position[/TD]
[/TR]
[TR]
[TD=“align: right”]1[/TD]
[TD] John [/TD]
[TD] owner[/TD]
[/TR]
[TR]
[TD=“align: right”]2[/TD]
[TD] Mary[/TD]
[TD] manager[/TD]
[/TR]
[TR]
[TD=“align: right”]3[/TD]
[TD] Ingrid[/TD]
[TD]clerk[/TD]
[/TR]
[/TABLE]

Since there’s a onbeforeupdate event I think you could use this event to skip the record?

I think you can use in onload record event for prevent entry to your record. you must use the macro for disable the fields.
if ({ID} = 1) {
…Use Macro for disable the fields
}