Scenario:
Stock control untick = Service Item
Stock control tick = Stock Item
If Sales invoice selected Service item
How to Hide quantity in format?
Solution:
Press Task > Press Design.
Select the format user would like to amend.
Press Quantity field > Press the small properties field
Press the 3 dot button of Formatting rules
Press Edit Rule Sheet
Press the green '+' / add button.
Set Visible to NO, and give a name.
Then, Press 3 dot Button of Condition, give a condition
[Stock].[Stock Control]==false
Apply the rule
Then Save the format
Result
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