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If the Project Costing functionality is enabled in the application on the Administration > Settings > General Settings form Project Costing form, you can link a bank receipt with a related project which you can select in the Project field; to find a project, start typing its name or code in the field.
The Planning Document field is available if the Use a payment calendar option is selected on the Administration > Settings > Cash Management form Money form. The field is auto-populated in case of the bank receipt based on a Money Transfer (Plan) or Money Receipt (Plan) document.
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