Reading previous period value is logic

Question

Hi,
There's a need to read previous period value is logic for some processing, can you please help me out how this can be achieved. I have a selection for time in the package called %TIME_DIM% and I am running for the current period. I have tried following options
First
*WHEN XYZ
*IS "ABC"
*REC = (FACTOR=GET(TIME=PRIOR), SOMEDIM=VALUE)
*ENDWHEN
When above code executed with current period (no record exists for current period) nothing is read.
Second
*XDIMMEBERSET TIME = PRIOR, %TIME_DIM%
*WHEN XYZ
*IS "ABC"
*REC = (FACTOR=GET(TIME=PRIOR), SOMEDIM=VALUE)
*ENDWHEN
In the above case no record is selected and surprisingly the select statement fired (got it form the log) is for the last time period maintained in the system - 1. So if I have time dimension members till 2020.DEC this picks up 2020.NOV. I didn't understand why?
Would appreciate help on this.
Thanks

Answer 1

Anand,
It is not very clear what you are trying to achieve here.
Perhaps you already have this, but below some explanation about special time selections that you can use in SQL logic.
The time shift instructions
To simplify the calculation of leads and lags in financial reporting applications, the following new instructions have been implemented for SQL-based logics:
PRIOR
NEXT
BASE
FIRST
The instructions PRIOR and NEXT support an optional numeric parameter. This parameter represents the number of time periods by which the current period must be shifted. If omitted, the functions will assume a time shift of 1 period (forward or backwards). Negative values are accepted (A negative value for a NEXT function corresponds to a positive value for a PRIOR function and vice-versa).
Examples:
TIME=NEXT          // In a monthly application this means next month
TIME=PRIOR(3)     // Three periods backwards
TIME=NEXT(-3)     // Same as PRIOR(3)
The keyword BASE always represents the last period of prior fiscal year. When the fiscal year is a normal calendar year and the frequency is monthly, the base period of 2004.JUN is 2003.DEC.
The instruction BASE can be useful in YTD applications, where the opening balances need to be retrieved from the last period of prior year.
The keyword FIRST always represents the first period of the current fiscal year. When the fiscal year is a normal calendar year and the frequency is monthly, the base period of 2004.JUN is 2004.JAN.
In case the time shift goes past the boundaries of the TIME dimension, these time shift functions will return no period.
These functions can be used in four ways:
-     To re-direct the destination period in a *REC statement
Example 1: *REC(TIME=NEXT)
Example 2: *REC(TIME=BASE)
-     To retrieve a value from a different period in a *REC statement
Example 1: *REC(FACTOR=GET(TIME=PRIOR(3))
Example 2: *REC(FACTOR=GET(TIME=BASE)
-     To add periods to the selected data region in a XDIM_MEMBERSET statement
Example: *XDIM_MEMBERSET TIME=PRIOR, %TIME_SET%
In this example, if the first modified period is 2004.APR, the instruction PRIOR will add 2004.MAR to the region to process).
-     When the keywords PRIOR, FIRST or BASE are added to a XDIM_MEMBERSET instruction, the time period PRIOR, FIRST or BASE can be also evaluated in a WHEN / ENDWHEN structure, like in the following example:
*WHEN TIME
*IS PRIOR
     // ignore
*ELSE
     *REC(u2026)
*ENDWNHEN
In presence of an XDIM_MEMBERSET containing the PRIOR keyword, like in the above example, the WHEN structure here shown will recognize 2004.MAR as PRIOR period.
Following is an example of logic that performs a carry-forward of account ACCREC, while adding to it the periodic amount from EXTSALES.
*XDIM_MEMBERSET TIME=PRIOR,%SET%,%PREFIX%.DEC
*CALC_EACH_PERIOD
*WHEN TIME
*IS PRIOR
     *WHEN ACCOUNT
     *IS ACCREC
          *REC(ACCOUNT=u201DOPEACCRECu201D,TIME=NEXT)
     *ENDWHEN
*ELSE
     *WHEN ACCOUNT
     *IS EXTSALES
          *REC(FACTOR=-1,ACCOUNT="OPEACCREC",TIME=NEXT)
          *REC(FACTOR=-1,ACCOUNT="ACCREC")
     *IS OPEACCREC
          *REC(ACCOUNT=u201DACCRECu201D)
          *REC(ACCOUNT=u201DACCRECu201D,TIME=NEXT)
     *ENDWHEN
*ENDWHEN
Hope this helps,
Alwin