It appears as though an expression won't work in the target field. Interestingly, though, this actually compiles for me on 2017.1:

It errors when the rule executes:

I've done dynamic routing in a BPL code bock using ObjectScript, though, and you could certainly write your own BP in Studio for it ... see the methods SendRequestSync()/SendRequestAsync() in Ens.Host, of which Ens.BusinessService/BusinessOperation/BusinessProcess are subclasses.

Are you sure you're looking at the right task? I/O logs would normally be purged using Ens.Util.Tasks.Purge, which is also used to purge messages, alerts, and other production logging. Here's a task I created specifically for demonstration purposes. You won't find this in your scheduled task list by default. You may have another, similar task that someone may have set up in your environment, though:

It's not a character set problem, it's a malformed HL7 problem. If the vendor sending the message needs to include a carriage return character in the middle of a segment, they should be escaping it. 

If the vendor won't fix it, you're probably looking at overriding the inbound service's OnProcessInput() method to strip out \0x0D\0x0A sequences and replace them with something else. If they're in there for textual formatting purposes, you'll need to know what the target system expects for a line-break character sequence.

Hi Scott,

What metadata are you referring to? Document properties such as Title, Author, Subject, Keywords, etc. or are you looking to actually extract patient data from formatted page elements?

It doesn't look like HealthShare has any built-in PDF parsing features, but there may be something developed by the community (if there is, I'm not aware of it, though). If it's the properties I mentioned above, though, they're normally stored near the end of the file and it's conceivable that you could scrape them out with COS. To do it right, though, I think you'd want to call an external utility to fetch it. The pdfinfo utility in xpdf does that pretty efficiently:

jdrumm@oobuntoo:/mnt/hgfs/DDownloads/Intersystems$ pdfinfo Sample.pdf 
Title:          Sample
Subject:        Just another pdf
Keywords:       test metadata cache fetching
Author:         Jeff Drumm
Creator:        PDFCreator Version 1.7.3
Producer:       GPL Ghostscript 9.10
CreationDate:   Wed Aug  2 07:32:38 2017

If you're looking to get data stored as formatted page elements, though, that's an entirely different challenge.