Extra space

INVOICE .itrlink

>I have trying to get some fields from the table detail. If has 2 tables linking to it, a live transaction file and a historical transaction file. When I run this I get an error saying that the alias history is not found
>
>

>select LiveDetail.ide_key ;
>		, LiveDetail.idelink ;
>		, LiveDetail.stkref ;
>		, LiveDetail.desqty ;
>		, LiveDetail.linavgc ;
>	from INVOICE ;
>		join DETAIL as LiveDetail on INVOICE .itrlink = LiveDetail.idelink ;
>	where INVOICE .period >= 201801 ;
>		and INVOICE .stage = "70" ;
>union ;
>	select HistDetail.ide_key ;
>		, HistDetail.idelink ;
>		, HistDetail.stkref ;
>		, HistDetail.desqty ;
>		, HistDetail.linavgc ;
>	from HISTORY ;
>		join DETAIL as HistDetail on HISTORY.itrlink = HistDetail.idelink ;
>	where HISTORY.period >= 201801 ;
>		and HISTORY.stage = "70" ;
>	into cursor TempCursor
>