Sales Timesheet: exclude Timesheet Line from Sale Order

This module adds a "Non-billable" checkbox to timesheet entries (the account.analytic.line records). When you tick it, that timesheet line is excluded from the Sale Order: it no longer gets linked to a sale order line and is treated as non-billable, so it will not be billed to the customer.

Where you see it: - In the timesheet list and form views, next to the task and date fields. - In the Timesheets tab of a task form, just before the Sale Order Line column.

Business rules and automatic behaviour: - Ticking the checkbox forces the timesheet's invoice type to "non-billable" and clears its sale order line. - If a timesheet has already been invoiced and its sale order line uses a delivery-based invoicing policy, changing this checkbox raises a validation error, protecting already-invoiced work. - The field is not copied when duplicating a timesheet.

Access is controlled by a dedicated security group "Exclude timesheets from sale order"; only users in that group can see and use the checkbox. The module touches timesheets (account.analytic.line) and the task form (project.task), and depends on the standard Sales Timesheet app.