SAP disabled this logic again in 9.2 PL07. The only solution is to upgrade to 9.2 PL07 if you are affected by this issue.
In SAP 9.2 PL04 and higher SAP has changed the behavior for a field being set to Enabled = False. Prior this was only for the mode the field was currently in, but now enabled = False stay disabled despite mode change.
B1UP Module "Make Items Read Only" can't cope with this unannounced change currently and this results in, for example, if you make a field read-only in the OK mode, it stays read-only when you switch to find mode.
As a workaround, you can manually enable the field again via a B1 Validation that when example switch to Find mode run an Enable($[$item.col.type]) command that opens the field again.