Hi Steve,
Here is a list of the supported user defined codes available for sending information to Ledger batch descriptions. I have bolded the note that I think will answer your question.
%ven - for Vendor code
%vnm - for Vendor name
%ref - for Reference
%dno - for Document number
%des - for Description (see Note 1)
%ds2 - for Description 2 (Header)
%dst - for Distribution code
%psq - for Posting sequence
%bat - for Batch number (see Note 3)
%ent - for Entry number (see Note 3)
%job - for Job/Phase/Category code (see note 2 and 3)
%cln - for TB Client number, transaction Type=Time Billing only (see Note 4)
%dkn - for TB Docket number, transaction Type=Time Billing only (see Note 4)
%dis - for TB Distribution code, transaction Type=Time Billing only (see Note 4)
%src - for TB Source code, transaction Type=Time Billing only (see Note 4)
%os1 - for Optional string 1
%os2 - for Optional string 2
%os3 - for Optional string 3
%od1 - for Optional date 1
%od2 - for Optional date 2
%oa1 - for Optional amount 1
%oa2 - for Optional amount 2
%ou1 - for Optional unit 1
%ou2 - for Optional unit 2
%bs1 - for Batch Optional string 1
%bs2 - for Batch Optional string 2
%bs3 - for Batch Optional string 3
%bd1 - for Batch Optional date 1
%bd2 - for Batch Optional date 2
%ba1 - for Batch Optional amount 1
%ba2 - for Batch Optional amount 2
%bu1 - for Batch Optional unit 1
%bu2 - for Batch Optional unit 2
NOTE 1: If you have enabled Allow edit of G/L distribution description in the Company Profile, %des will send the Detail Description for the invoice to Ledger.NOTE 2: When sending to JobCost, if the Detail Description field is 'blank', the Header Description field will be used.
NOTE 3: Codes %bat, %ent and %job are invalid for system checks and check reconciliation. %job is not valid for manual checks.
NOTE 4: TB codes %cln, %dkn, %dis and %src are not valid for manual check Payments, use with Cash Invoices and Invoices. TB codes are not valid for sending to Adagio JobCost.