I have experience a behavior that comes a bit weird to me.
 
When scanning a UPCA barcode the data wedge for android with the DWDemo app (and also the emdk for windows) reports an extra zero as a prefix if I have the "Scan params" - Code Id Type set to "Code Id Type Aim".
Screenshots etc can be found in the documentation here: Barcode Scanner Parameters - Zebra Technologies TechDocs
 
To recreate this:
Use the data wedge with the DWDemo app
 
1 Change the "Scan params" / "Code Id Type" to "Code Id Type None"
2 Make a scan of an UPCA barcode
 
3 Change the "Scan params" / "Code Id Type" to "Code Id Type Aim"
4 Make a scan of the barcode again
 
5 Notice that four characters has been added to the barcode.
 
My question is how this can happen when the documentation says:
Barcode Scanner Parameters - Zebra Technologies TechDocs :
Code ID Type Aim - Inserts a standards-based three-character prefix.
 
Are there any settings that only apply if you set it to "Code ID Type Aim"?
 
I have made sure that "Decode params" / UPCA / Preamble has been set to "Preamble None"