Here are a few questions, starting with what are the RTE NUM AMT values of the WT being processed in ZWSC?
Your first example is as follow :
ZWSC 3 RTE=KXXXXX -9.00
ZWSC 3 DIVID RN -4.36
For operation DIVID, it's hard to check the result because we don't know what is the original value of NUM. Furthermore, where do you put the result? The operation should be DIVID RNN based on the next operation.
ZWSC 3 NUM*-1 4.36
ZWSC 3 AMT?0.00 4.36
Here, we have to assume that the original AMT is smaller than zero, based on the return value.
ZWSC 3 < AMT=KXXXXX 4.00
ZWSC 3 < MULTI NAA 17.42
After NUM*-1, you mention that NUM = 4.36, and on the next line, you mention that AMT = 4.00 (Kxxxxx).
Then, how can MULTI NAA give AMT = 17.42 ?
ZWSC 3 < ZERO=NR
ZWSC 3 < ADDWTEXXX 17.42
ZWSC 3 < RTE=KXXXXX 7666.66
ZWSC 3 < AMT*1000 17422.22
If AMT = 17.42 (or 17.44 by my calculation), how can AMT*100 not give 17420.00 (or 17440.00 if 4.36 x 4.00 = 17.44)
ZWSC 3 < DIVID ARA 2.27
ZWSC 3 < ZERO= NR
ZWSC 3 < ADDWTEXXXX 2.27
ZWSC 3 < AMT*-1 -2.27
After ZERO= NR, you had AMT= 17.42, multiplied by 1000 gives AMT= 17420.00, divided by 7666.66 gives AMT= 2.27, and multiplied by -1 gives AMT= -2.27. How do you come up with AMT= 15.15 ?
ZWSC 3 < ZERO= NR
ZWSC 3 < ADDWTEXXXX 15.15