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Is it possible to set ShowMandatory on lookup fields?
sure. For example 'Sell-to Customer No.' is set as ShowMandatory on the Sales Order.
As Robertas wrote, it is possible. Please refer here:msdn.microsoft.com/.../dn789528(v=nav.90).aspx , but notice important disclaimers there regarding default values and C/AL functions validation.
But it is not flowfield (lookup)?
Oh, that kind of lookup. Then no, you can't. The field has to be editable for ShowMandatory to work, and you wouldn't want to leave FlowField editable.
You can refer to this topic as it is discussed before.
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