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Sales Invoice Line - calculation based on sum of other lines

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Hi all,

We have a scenario where, in Sales Invoice Lines, we want to be able to add a line which is a % of the total value of other lines within that invoice. Its a way of adding a standing charge onto the invoice.

To give an example, we may have an invoice going to a client as follows

Line 1:  Services       €2000

Line 2    Products      €3000

Line 3    Expenses    €100

Is there a way (apart from manually calculating add adding in each time) we can have the Sales Invoice add a Line 4 which is a % of Line 1 & 2 added together. So if we said 10%, it would look like

Line 4  Standing Charge €500

Does anyone know of any way to do this?



  • Verified answer
    DAnny3211 Profile Picture
    DAnny3211 9,180 Super User on at
    RE: Sales Invoice Line - calculation based on sum of other lines


    you should have your partner develop a customisation


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