Pass SOHistoryID in report

[2can2]

Hi, I have a SO report converted from V6 to V7 but I can't seem to get it to pass the current SO on print. I am not using a st proc only tables. In the JiwaRanges I have tried
//{@Pass_InvoiceHistoryID} where a formula field exists - Pass_InvoiceHistoryID = {SO_History.InvoiceHistoryID} but it won't print the current SO.
If I set the Record, Select Formula, Record to {SO_History.InvoiceHistoryID} = '5deba55257e441a4a51b' a known ID it displays in Crystal correctly?
Where am I going wrong. Ta.

[2can2]

Found the issue. Thanks.