from your sample, i have now done what is needed, this is just the frist sample i did to get the blob text. will buid the OutSTream later. But thanks for your guidance :)
Its not possible out of the box. Posted documents/entries are not allowed to be modified in Business Central. This is true system wide except for certain exceptions (several fields). This is done to maintain data integrity and have an audit trail.
In a posted sales invoice there is an Update Document button that does allow modifying several fields (the exceptions mentioned above) in the posted document. If you want to modify the work description a developer would have to customize the system to add the work description as one of the fields that can be modified when using this Update Document button.
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