Explain this statement

It depends where the statement is.  I assume it's in a proposed settlement agreement.  If so, in some cases, injured workers cannot "close out" their claims for permanent disability, and a common example is permanent total disability.  It could also happen in an interim or intermediate settlement that does not close out the claim entirely, and where you have not reached a point of medical stability called "maximum medical improvement" when permanency would be determined.  In this context, the statement would simply mean that you've worked out some issues in the agreement, but concede that there are other issues (namely, permanency) that are too early to close out, so you're leaving them open.