Schema and layout problem deleting fields in Nuxeo Studio

We have problems deleting fields in Nuxeo Studio.

SCENARIO:
1. We create a schema with 4 fields (field1,field2,field3,field4)
2. Delete the 2nd one. --> After delete it, everything seems ok. Now we have field1, field3 and field4
3. Delete the 2nd one of the list (field3). --> Instead of deleting the field3, Nuxeo Studio deletes field4. Now we have field1, field3
4. Delete the 2nd one of the list (field3). --> Nuxeo Studio shows an error:

Uncaught exception: java.lang.IndexOutOfBoundsException: Row index: 3, Row size: 3
at Unknown.UVb(Unknown source:0)
at Unknown.CCb(Unknown source:0)
at Unknown.nDb(Unknown source:0)
at Unknown.RCb(Unknown source:0)
at Unknown.Chd(Unknown source:0)
at Unknown.Afb(Unknown source:0)
at Unknown.Ofb(Unknown source:0)
at Unknown.tB(Unknown source:0)
at Unknown.anonymous(Unknown source:0)
at Unknown.TC(Unknown source:0)
at Unknown.anonymous(Unknown source:0)
at Unknown.anonymous(Unknown source:0)