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The required fields are: Employee, Employment Date, Entity, and Rates.
The "Employment contract (create)" form. The Main tab
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In the Entity field, select the legal entity of your company which creates this employment contract. The Entity field is available if the Multi-Company Accounting option is selected on the Administration > Settings > General Settings form. The default entity for all users can be selected on the General Settings form Accounting > Master Data > Entities form. Also, you can specify your personal default entity, for details refer to Personal Settings.
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