Confuse with the following, need further advise :
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Customise Form for Standard Doctype, and export customisation will allow us to export this form customisation to the Custom App.
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We should not modify directly for standard doctype (e.g. : Sales Order or Sales Invoice ), in fact, we should do as point (1) as above mentioned.
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For custom doctype, we should modify directly at custom doctype instead of custom form. Correct ?