/564(Advance payment) created. Need advise how to handle it

Folks,

I have a scenario in one of the pay period /564(Advance payment) generated and it is shown in the Rem Statement. I have verified in the payroll results that /559 and /564 has the same amount for all the perners(About 1500). Can anyone please advise how to handle this issue. I have ran the simulation payroll for next pay period for one of the Perner, /564 not generated but /564 shown in the YTD amount(previous pay period amount).. Please advise how to handle this.

Thanks,

Srini