As we found out (with @Andrii_Humeniuk , see https://forums.autodesk.com/t5/product-design-manufacturing/inventor-osoblivosti-oformlennya-kreslen... ), information about Spline Connections is stored in the assembly in the "Occurrences" branch: oAssDoc.ComponentDefinition.Occurrences(i).AttributeSets(1).Item(2).Value

It can be obtained using iLogic/VBA, taking into account that the “Value” parameter stores a link to the standard code and to the standard data table in
C:\Users\Public\Documents\Autodesk\Inventor 202X\Design Data\Design Accelerator\Tables\Splines*\namestd.xml
namely in "SplineType" - Standard Code in the form, for example, for ISO 14
<Table InternalName="605A0796-2412-4aa9-81E0-E36325D0AE4F">, and in “Spline” – the line number in the list of possible spline parameters of this standard.
Then you can either rename this element in the assembly or part and/or add a user parameter, which you can then use to call out symbols both in the model and in the drawing.


Of course, the best option would be to create a tool like "Hole and Thread" for the drawing environment that allows you to automatically apply the designation.
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Олександр Черніков / Alexander Chernikov 
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