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                   58504 Points
                   Joined June 2010
                
               
			  
			  
             
            
             Hey Atharv! The JSON validation error related to the MAT schedule for ITR-6 AY 2021-22 is a known issue sometimes faced on the e-filing portal, especially when the MAT schedule is not applicable but the system expects it.
Here are some quick tips to fix this:
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Ensure you are using the latest ITR-6 utility from the Income Tax e-filing website. Old utilities may cause schema mismatches. 
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Double-check the JSON file: Open it in a text editor and search for any MAT schedule related fields. They should either be blank or removed if not applicable. 
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Use the offline utility to generate JSON rather than third-party software. The official utility handles non-applicable schedules better. 
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If the portal insists on MAT schedule data, fill the schedule with zeros or "Not Applicable" as allowed in the utility. 
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Clear browser cache or try a different browser — sometimes UI glitches cause improper validation. 
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If all else fails, contact the IT e-filing helpdesk with the JSON file for specific support.