You cannot edit the properties of checked-out files in the Datasheet view of a SharePoint document library after you install Access 2007 SP3

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KB Article: https://support.microsoft.com/kb/2598126

INTRODUCTION

Assume that you install Microsoft Office Access 2007 Service Pack 3 (SP3) on a computer. Then, you try to edit the properties of checked-out files in the Datasheet view of a SharePoint document library. In this situation, you receive the following error message:

The selected cells are read-only.