Issue with Write Optimized DSO in BI 7.0

Hi Guys,
I have an issue reagarding Write Optimized DSO in BI 7.0.
First, I explain the scenario..
We have some Master Data Objects around 5. We have a source system for load master data.
The design is like this
There is a DSO which gets the data from 30 Master Data Sources and feeds 30 Master Data objects (Info Objects).
The process of loading master data is before loading the new loads previous load requestes have to be deleted from this Write Optimized DSO and current loads have to be loaded. This entire process is done through Process Chains.
In this regard. every thing is going smoothly. But for last somedays Deletetion of Requests in Write Optimized DSO process showing its failed (Red Color) with error (pls. check the below screen shot for that) even though the previous requested in DSO got deleted and new load requested added in DSO Manage Tab.
What I am thinking is, its merely Fron End Problem, If am not wrong please help me in this regard.
Please let me know is there any notes for related this issue, ot something other solution.
THanks in Advance
Peter ....

how it is resolved how u did u done the procedure ?

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