Thanks Noel , I just tried both settings, but still have the same problem.
I asked Chat GP and got this answer

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To tell Band-in-a-Box not to play A7 in that bar and instead play the straight A chord, you can use the RealTracks Settings dialog. Here's how you can access it:

Press the [Prefs] button in the RealTracks Settings dialog.
In the RealTracks Settings dialog, locate the track that corresponds to the A chord.
In the "Holds" column for that track, check if there is a number or an "n" listed. If there is a number, it means that the RealTrack supports shots, holds, and pushes. If there is an "n", it means that the RealTrack supports them, but you don't have the necessary Holds files.
Assuming you have the necessary Holds files, you can now use Band-in-a-Box as you normally would. Type the chords with shots (C..), holds (C...), or pushes (^C or ^^C for 8th or 16th note push), or combinations of push and hold (^C....).
If you want to specifically prevent A7 from being played, make sure you don't include any periods (...) after the A chord. This will indicate to Band-in-a-Box that you want the straight A chord to be played instead of A7.
By following these steps, you can customize the chords played by Band-in-a-Box and ensure that only the straight A chord is played in that particular bar.
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Doesn't make sense to me!