Pensionable salary for epf pension computation - if arrear of PF wages is taken for average pensionable salary?

kvbmol
An employer remits arrears and regular contributions of PF in a month. The arrears were paid for the previous 20 months. When an employee retires from employment the pensionable salary is taken as an average of 60 months PF salary.
My question is if this arrear of PF wages is taken for average pensionable salary?
EPF regional office says they can not account it as the employer is remitted the arrears in by a single challan.
They say if the employer submits the arrears through 20 separate challans then only the PF arrear wages can be taken for pensionable salary.
Madhu Sir please give me clarification on this .it is very urgent as some retired employees are waiting for their pension.
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