Yes, the / character is not a keyworded symbol (and is therefore treated as an 'end of keyword' character). The documentation could be more clear on this, we will update the help file to better clarify what is and is not included in keywords. You can view the keywords identified for Info Items with Item | Keywords ... (Ctrl+K is the default keyboard shortcut).
If the string DP/51S1 is in the title or other attribute of the Info Item you are searching for, you can use a Quick Search criteria of "DP/51S1" (or just "DP/51S1), which commands Ultra Recall to do a Matches Wildcard search on all Attributes instead of a Contains Keywords search.
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