With Maintenance Invoicing module - on the Asset Card you can specify if the Asset is billable or not. You can also specify the Bill-to Customer No.. You can find related fields in the Additional Information ** part.
When this setup on the asset exists - all new work order plans for this asset will be marked as billable, and if the customer no. is specified - every new work order from these plans will get the customer no. value.
By selecting the assist edit button next to Billable field on the Asset Card - you can open a list of all work order plans from this asset with the information if the work order plan is billable, and if related work order is billable.
From that list (by using dedicated actions - Set Plans Billable/Set Plans Non-Billable) you can edit these plans and update their billability.
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