Operations from PCR in simple english.

Question

NUM= BWGRL
NUM= PLANS
NUM?0
ZERO= N
GCY X112
ADDWT
above are some of the operations from PCR  X012 Calculate valuation bases for alternative payment
as we know, there is a logical meaning for all the operations listed above however there must be a simple English explanation for the same. I have created this thread so that all these technical operations can be deciphered in simple english.
One example i would like to include is as follows
ADDWT
ADDWT     blank     -     Means Add Wage Type to      Output table(OT)
ADDWT     A     -     Means Add Wage Type to      Previous employer table (VAG)
ADDWT     C     -     Means Add Wage Type to      Cumulation table(CRT)
ADDWT     D     -     Means Add Wage Type to      Difference table (DT)
ADDWT     E     -     Means Add Wage Type to      Results table (RT)
ADDWT     G     -     Means Add Wage Type to      Gross results table (GRT)
ADDWT     H     -     Means Add Wage Type to      Alt. results table (AIT)
ADDWT     I     -     Means Add Wage Type to      Input table (IT)
ADDWT     L     -     Means Add Wage Type to      Results table last payroll (LRT)
ADDWT     M     -     Means Add Wage Type to      Incentive wages results (LS)
ADDWT     N     -     Means Add Wage Type to      Loan (LO) (can only be used with function P0045)
ADDWT     O     -     Means Add Wage Type to      Output table (OT)
ADDWT     S     -     Means Add Wage Type to      Cumulated and variable info (EX/ES)
ADDWT     U     -     Means Add Wage Type to      Difference table (DFT)
ADDWT     W     -     Means Add Wage Type to      Wage maintenance table
ADDWT     X     -     Means Add Wage Type to      Cumulated tax table (SCRT)
Please share your understandings of as many operations as possible as it can help non technical consultants understand the the meaning of operations easily.

Answer 1

I believe that SAP has tried to translate in "simple english" the documentation of operations, and the same could be said of functions and features.  The problem is trying to explain all possibilities.
For example, the documentation for operation ZERO= mentions that "Operation ZERO= initializes fields in the  current header entry of a table or variable" and that it's syntax is OOOOOSVVVV where OOOOO is the operation (ZERO=), S is the operation sign (blank or &) and VVVV is the name of the temporary variable or the field.  So:
ZERO= RNA     means zero out the values in the Rate, the Number and the Amount fields of the WT being processed
ZERO=&9999   means zero out the temporary variable 9999 (in table VAR)
ZERO= N          means zero out the value of the Number field of the WT being processed
When it comes to Payroll operations RTE, NUM or AMT, there are over a dozen operators and a multitude of operands, these last ones divided into 5 different structure variants, as in
NUM=X nnnn           ......Wage types
NUM=Xnnnnn           ......Table fields
NUM=nnnnnn            ......Direct values
NUM= nnnnn            ......Report layout fields (with one space between = and nnnnn)
NUM=    nnnn          ......IT wage types (with two spaces between = and nnnn)
The 2 examples in your PCR correspond to the 4th variant (a space followed by 5 characters) so they relate fo Report Layout Fields.  If you drill down in the documentation for operation NUM, 6 places operands, 4th variant, Record Layout Fields, you'll notice that BWGRL corresponds to Valuation basis per hour.
But to come back to your PCR, operation NUM= BWGRL is useless since it is followed immediately by NUM= PLANS, which is like saying: Replace the number field by the Valuation basis per hour and replace the valuation basis per hour by the position (PLANS), the second instance of NUM= overwriting the first one.