Search issue in UCM with Full text search enabled

Hi,

We have made a custom field in UCM and need to enable search on it. While searching with Full text search enabled, we are searching with a custom field like this: xucmCase <matches> `1-1PN29A`. As per documentation available, when full text search is enabled, then a Minus(-) sign immediately in front of a term excludes the item from the search results. But as per our scenario, the format of the field value is like '1-1ABC2D', but due to the minus(-) sign being present in the search term, the search results are not exactly as per requirement.