If the deduction w/t's are configured in V_T51P6, the payroll function PRPRI will not allow creating a claim.
Also check the proc cl 05 for all your earning/payment w/t's. The pcr Q030 creates w/t /550 based on a w/t's proc cl 05 value.
The w/t /550 is used in PRPRI to apply deductions not exceeding the amt in /550, after deducting tax.
This function is processed only for the current period (and not for retro).
When an employee's deduction is changed from a previous period, the function PRDNT uses this table to bring back entries in DDNTK or ARRRS, and will not allow change in a dedn in a retro period; based on the w/t's config in this table/view, it may bring any change for a previous period to the current period and try to apply for the dedn w/t (the difference from previous period/s) plus (this period's dedn amt).