There is an issue when a user goes to link a solution to more than one case.
When a user tries to link a solution to a case that has already been linked to another case, this solution is not available for selection in the selection box.
This issue has been resolved in Sage CRM 7.2i.
This issue is not happening in Sage CRM 7.2d.
This issue was reproduced in Sage CRM 7.2g