Make sure that Your index value profile grants ALL rights that are necessary to participate in that workflow task. <br>
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Your workflow task may <strong>apply a stamp</strong> or c<strong>hange some index value.</strong> If done within the task activity, these things happen within the rights scope of the logged in user. <br>
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Most likely the index value profile allows the user to view and edit the document, but he is not allowed to add to annotations (stamp) or change certain index values. The latter is especially important for index values that have recently been added to the file cabinet, as these will per default explicitly NOT be included in existing custom or index value profiles.