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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