If gst number is showing invalid but it is valid than need to update regular expression of the field to ^[0-9]{2}[A-Z]{4}[0-9A-Z]{1}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}[0-9A-Z]{2}$
for that right click on that field or f4 then click on the edit button of regular expression and update the regular expression with the expression mentioned above
Troubleshooting
GST NUMBER
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