Losing a document in a dream means that the dreamer will take a step back on a subject that he used to talk too much about and will accept his disrespect and mistake. This means that the issue will be completely closed.
To see that you have lost a document in your dream means that you will realize some of your faults, will understand that your loved ones and the ones you value the most because of these faults and deficiencies, and will decide to tidy yourself up.