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Update Simulation in the Monitor 
Use
Before you post the data from the PSA or ALE inbound processing into the data targets, or if the update into the data targets failed during the loading process, you can simulate the posting. The debug option for the transfer rules and update rules supports you when searching for errors in case the update into the data targets in the transfer or update rules was terminated.
If you have switched on error handling via the Scheduler (Update Parameter tab page), then in the event that the field content in a data record cannot be transferred from the transfer structure format into the communication structure format, an error is logged in the monitor. The error message delivers detailed information about which field value in the data record could not be converted. We recommend in addition to switching on the error handling, that you switch on the consistency check for characteristic values in the Scheduler (Processing tab page).
In the event that the data record is correct in both in the source system and in the PSA, you can execute the error analysis for the transfer rules by simulating an update for a data package in the monitor. In the breakpoint that was set as the standard setting, you find additional information that supports you when searching for errors with the debug function for the transfer rules.
If the error appears first in the update rules, the system likewise logs an error message. You then have the option of debugging the update rules for the error analysis.
Prerequisites
The data was successfully received in BW.
Functions
You can simulate the update on a data package level. In doing so, you can determine for which data target the simulation needs to be executed and which records need to be used for the simulation.
Activities
You get to the Simulation Selections dialog box.
You see the data in the communication structure format. In the case of data with flexible updating, you can change to the view for data target data records. In the data target screen you can display, for selected records, the records belonging to the communication structure in a second window.
If you have switched the debugging on, you arrive at the ABAP Debugger, and you can execute the error analysis there.