A single vertex group will not transfer weights (Data Transfer modifier)

I’ve tried all day to get these vertex weights to transfer to multiple types of meshes and the same vertex group doesn’t transfer each time.

I’ve checked for duplicate vertex groups and it’s not it. Also, tried another version with the same results. I’m pretty much stumped.

Steps to replicate:

-Delete vertex groups from mesh
-Apply a Data transfer modifier to it
-Use the body mesh as the source
-Vertex Data
-Vertex Groups
-Generate Data layers
-Apply

You will see that the Spine bone’s weights will not get transferred.

The weight transfer does work with the old method in weight paint mode(version 2.70)

I’ve been using Blender for several years and have weighted several items and have never encountered this issue before.

Blend file is attached

Attachments

Data Transfer issue reference.zip (295 KB)

After cleaning the groups (weight paint - clean) it worked. You had like 30 empty vertex groups for every vertex which seems like it caused a problem.

Thank you very much Cyaoeu. I’ll try this out.