Need clarification on using *COMMIT

Hi,
I have the following code, which works perfectly fine on its on.
*XDIM_MEMBERSET CATEGORY=ACTUAL
*WHEN A_ACCOUNT
   *IS SALARY
            *REC(FACTOR=1,CATEGORY="BUDGET")
*ENDWHEN
It'll overwrite the value in BUDGET.SALARY with the modifed ACTUAL.SALARY. Such overwrite is what I want.
I need another calculation for A_ACCOUNT.KPI0007; so I add the following code before the code written above. I got a correct value for KPI0007.
However, the above code does not perform well. The new value of ACTUAL.SALARY will be added up to the existing value of BUDGET.SALARY instead of overwriting BUDGET.SALARY. This is NOT what I want
*WHEN A_ACCOUNT
   *IS SALARY
      *REC(EXPRESSION=(GET(A_ACCOUNT="SALARY")+GET(A_ACCOUNT="BONUS")*0.7),A_ACCOUNT="KPI0007")
*ENDWHEN
Somehow, I accidentally solve the issue by putting COMMIT in between, which looks like the following. I know that COMMIT is used to put the calculated values into the database. Yet why this is needed in this situation?
*WHEN A_ACCOUNT
   *IS SALARY
      *REC(EXPRESSION=(GET(A_ACCOUNT="SALARY")+GET(A_ACCOUNT="BONUS")*0.7),A_ACCOUNT="KPI0007")
*ENDWHEN
*COMMIT
*XDIM_MEMBERSET CATEGORY=ACTUAL
*WHEN A_ACCOUNT
   *IS SALARY
            *REC(FACTOR=1,CATEGORY="BUDGET")
*ENDWHEN
Could somebody help explain this?
Thank you!
Sunny
Edited by: Sunny Im on Jan 15, 2009 2:58 PM
Edited by: Sunny Im on Jan 15, 2009 2:59 PM

Hi Sorin,
Thanks for your prompt reply. You have explained your example to me very well. However, I think my case is a bit different from it.
In my first WHEN statement, I put the calculated result into KPI0007. Yet I'm not re-using KPI0007 in my 2nd WHEN statement.
*WHEN A_ACCOUNT
   *IS SALARY
      *REC(EXPRESSION=(GET(A_ACCOUNT="SALARY")+GET(A_ACCOUNT="BONUS")*0.7),A_ACCOUNT="KPI0007")
*ENDWHEN
*COMMIT
*XDIM_MEMBERSET CATEGORY=ACTUAL
*WHEN A_ACCOUNT
   *IS SALARY
            *REC(FACTOR=1,CATEGORY="BUDGET")
*ENDWHEN
It's strange to me that if I don't put COMMIT in between, the 2nd WHEN statement won't use revised ACTUAL.SALARY value and overwrite it to BUDGET.SALARY. Instead, it will keep on aggregating revised ACTUAL.SALARY value to BUDGET.SALARY.

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