First check the AR amount without payment:
   
   SELECT SUM(amount) FROM acc_trans WHERE trans_id = ID and chart_id in (select id from chart where link not like '%_paid%');
  
Then check payment amount:
  
    SELECT SUM(amount) FROM acc_trans WHERE trans_id = ID and chart_id in (select id from chart where link like '%_paid%');
    
Or run a query to compare all values from the two tables:

     SELECT ar.id, invnumber, ar.amount, (SELECT SUM(amount) FROM acc_trans ac WHERE ac.trans_id = ar.id AND ac.chart_id IN (SELECT id FROM chart WHERE link NOT LIKE '%_paid%')) amount2 FROM ar WHERE paid <> 0 AND id IN (SELECT trans_id FROM acc_trans GROUP BY trans_id HAVING SUM(amount) = 0) GROUP BY 1,2,3;
     
Another query to check if transaction is completely balanced:

    SELECT SUM(amount) FROM acc_trans WHERE trans_id = ID