Starting with Strategy Web 9.3.0, it is possible to pass selector values from Source document to Target document via URL API on Strategy Web.
In Strategy Web you can add the following parameter &prevMsgID={&DOCUMENTMESSAGEID} in the URL to execute the target document. Make sure the selector is configured using the same attribute on both Source document and Target document.
For example:
Sample Code/Error
Main.aspx?&evt=2048001&src=Main.aspx.2048001&visMode=0&documentID=BA836DB6440606C5467900B5357C1DE3¤tViewMedia=2&prevMsgID={&DOCUMENTMESSAGEID}