This should work:
#Group(%BPInjectLocVarRptHdr),AUTO
#EQUATE(%LocRptHeader, 'LocRptHeader')
#IF(~INLIST(%LocRptHeader, %LocalData))
%[20]LocRptHeader STRING('%Procedure')
#ENDIF
INLIST( Item , Multi-Valued Symbol )
is one of the Built-in Template Procedures