Retro accounting for the last period difference problem

Hi guys,

i'm facing a problem here for the scenario of the period differences while i'm making a retro accounting .

i've maintained a data for an employee's basic with 1000 USD, and then i deducted from the same period with 1300 USD.

the difference shall appear in the accrued payable and for the first period everything was fine:

                 dr           cr

Basic      1000

Accrued   300

       Deduction      1300

while running the second period the system shall pay 1000 USD for the employee as a basic and deduct from him 300 USD the period difference, so the accrued in that case will be 700 USD , but the system shows it as 933.33 !!

                dr         cr

Basic    933.33

       Accrued   933.33

the claim for the period is 300 USD and it shows in the RT , & the Payment /559 is shown with 633.33 , so it seems for some reason the claim is added to the /559 , but still i dont know why the system doesnt pay 700 USD that it shall .

i've defined posting characteristics for the following WT :

the symbolic account for them is the accrued payable.

one last note that the posting document creating is creating very fine, but the amounts are wrong .

please let me know if you have any idea