Ah - but this happens with frightening regularity...the feature that is at the root of a defect or functional failure is often NOT specified on a drawing OR is not toleranced correctly. (After all there are thousands of features - geometries, properties, etc. - that go into any system and not all of them are identified and characterized resulting in engineered tolerances)
In these cases you will find defects/failures cased by a feature that a supplier creates and yet all specified tolerances on the drawing are met. The supplier is NOT responsible, you are. You must do the work to determine what the correct tolerances are for the feature in question and change the drawing. This can mean a price increase but such is life.
In these cases you will find defects/failures cased by a feature that a supplier creates and yet all specified tolerances on the drawing are met. The supplier is NOT responsible, you are. You must do the work to determine what the correct tolerances are for the feature in question and change the drawing. This can mean a price increase but such is life.