Dear,
do the following steps and confirm to me.
1. check info type 0585 ,0586 has been changed during this period,because if in this info type if you increased amount then system will recalculate the i tax calculation and may be income is under thresh hold limit so system is not deduction i tax.
2. check in past period have you use MVT1 wage type for deduction income tax in info type 0015.
Regards
Subhedar
9158881202