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I do not find any enclosed diagram so I don't know your topology.
In SCMU you get the contribution from the line, including the current fed in from the system at the other side of the line. The result in SCMU doesn't show the line charging of the line if zero sequence current enters the line at from bus during the fault.
In order to see the current contribution from the line's own capacitive charging you need to print the current at the other side of the line with activity SCOP. The difference comes from the capacitive charging in zero sequence from the line itself.
An example is shown below, using line 3005 - 3006 in savnw.sav:
psspy.sequence_network_setup(1)
psspy.scmu(1,[0,0,0,0,0,0,0],[0.0,0.0,0.0,0.0,0.0],"")
psspy.scmu(2,[1,3005,1,0,0,0,0],[0.0,0.0,0.0,0.0,0.0],"")
psspy.scmu(3,[1,3005,1,0,0,0,0],[0.0,0.0,0.0,0.0,0.0],"")
psspy.bsys(1,0,[0.0,0.0],0,[],1,[3006],0,[],0,[])
psspy.scop(0,0,0,1)
psspy.scop(1,0,1,2)
psspy.scop(0,0,0,3)
psspy.sequence_network_setup(0)
