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select the group group field
right click and select format field
select common tab
select formula button for 'Display String' option
NumberVar y;
NumberVar m;
DateVar firstday;
DateVar lastday;
StringVar t;
y:= YEAR((Minimum ({table.TransactionDate}, {table.TransactionDate}, "monthly")));
m:= MONTH((Minimum ({table.TransactionDate}, {table.TransactionDate}, "monthly")));
firstday:=DATESERIAL(y,m,1);
lastday:=DATESERIAL(y,m+1,1-1);
t:= TOTEXT(firstday,'d/M/yy') + ' to ' + TOTEXT(lastday,'d/M/yy')
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