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Are you using code 20 to change fixed bus shunt data? See example below:

 ACTIVITY? chng

 ENTER CHANGE CODE:
  0 = EXIT ACTIVITY                 1 = BUS DATA
  2 = GENERATOR DATA                3 = BRANCH DATA
  4 = 2 WINDING TRANSFORMER DATA    5 = AREA INTERCHANGE DATA
  6 = TWO-TERMINAL DC LINE DATA     7 = SOLUTION PARAMETERS
  8 = CASE HEADING                  9 = SWITCHED SHUNT DATA
 10 = IMPEDANCE CORRECTION TABLES  11 = MULTI-TERMINAL DC DATA
 12 = ZONE NAMES                   13 = INTER-AREA TRANSFER DATA
 14 = OWNER NAMES                  15 = MACHINE OWNERSHIP DATA
 16 = BRANCH OWNERSHIP DATA        17 = FACTS CONTROL DEVICE DATA
 18 = 3 WINDING TRANSFORMER DATA   19 = VSC DC LINE DATA
 20 = FIXED BUS SHUNT DATA         21 = INDUCTION MACHINE DATA: 20
 ENTER BUS NUMBER (0 FOR NEW CHANGE CODE, -1 TO EXIT): 151
 ENTER SHUNT ID (CARRIAGE RETURN FOR NEXT SHUNT, -1 FOR NEXT BUS):

 DATA FOR SHUNT 1  AT BUS    151 [NUCPANT     500.00]:
 STATUS  SHUNTG   SHUNTB
 OLD  1     0.00  -600.00 CHANGE IT? : 1
 ENTER STATUS, SHUNTG, SHUNTB
 0

 Power flow data changed for fixed shunt "1" at bus 151 [NUCPANT     500.00]:
 X--ORIGINAL--X  X-NEW VALUE--X  DATA ITEM
          1               0      STATUS
 ENTER SHUNT ID (CARRIAGE RETURN FOR NEXT SHUNT, -1 FOR NEXT BUS): -1
 ENTER BUS NUMBER (0 FOR NEW CHANGE CODE, -1 TO EXIT): -1

 ACTIVITY?