This thread is resolved. Here is a description of the problem and solution.
Client gets this error when trying to send a page for translation to a translationservice
Batch # 1
(12) Invalid state 'translating' to complete operation
Batch rolled back
Clearing the website cache helped remove the error.
Usually the WPML cache does not disturb this, as sending translation jobs is a core function of the plugin regardless of the state of the page.
It is possible to disable the WPML cache by adding this line to the wp-config.php file in the WordPress root directory:
define( 'ICL_DISABLE_CACHE', true );
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