"prepare_commit error in module tdb" importing schema

[Adam Tauno Williams]

Samba 4.0.0-alpha14

I've been having very good luck porting the schema we use to Samba4.
But now I'm stuck. Trying to import this attribute results in a
"prepare_commit error in module tdb: Protocol error (2)".

samba:/srv/cifs/test # /opt/ad/samba4/bin/ldbmodify -vv -H
ldap://10.66.77.1/ --user=administrator%fred123.7a test.ldif

ERR: (Protocol error) "LDAP error 2 LDAP_PROTOCOL_ERROR -  <del_trans
error on CN=Schema,CN=Configuration,DC=ad,DC=mormail,DC=com:
prepare_commit error on
CN=Schema,CN=Configuration,DC=ad,DC=mormail,DC=com: prepare_commit error
in module tdb: Protocol error (2)> <>" on DN
cn=Evolution-CompanyPhone,cn=Schema,cn=Configuration,DC=AD,DC=MORMAIL,DC=COM
Modified 0 records with 1 failures
samba:/srv/cifs/test # 

I've verified that an attribute of this name does not already exist.

test.ldif
------------------------------------------
# Attribute: companyPhone
dn:
cn=Evolution-CompanyPhone,cn=Schema,cn=Configuration,DC=AD,DC=MORMAIL,DC=COM
changetype: add
cn: Evolution-CompanyPhone
objectClass: attributeSchema
attributeId: 1.3.6.1.4.1.8506.1.2.17
ldapDisplayName: companyPhone
attributeSyntax: 2.5.5.12
oMSyntax: 64
dystemOnly: FALSE
rangeUpper: 32

The samba.log file says the following:
[Tue Nov 30 16:39:48 2010 EST,
0 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: schema_load_init: dsdb_set_schema() failed: 20:Attribute or value
exists: categories: value #1 provided more than once
[Tue Nov 30 16:39:48 2010 EST,
0 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: schema_load_init: dsdb_set_schema() failed: 20:Attribute or value
exists: categories: value #1 provided more than once
[Tue Nov 30 16:39:49 2010 EST,
0 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: schema_load_init: dsdb_set_schema() failed: 20:Attribute or value
exists: categories: value #1 provided more than once
[Tue Nov 30 16:39:49 2010 EST,
1 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: ltdb:
tdb(/opt/ad/samba4/private/sam.ldb.d/CN=SCHEMA,CN=CONFIGURATION,DC=AD,DC=MORMAIL,DC=COM.ldb): tdb_transaction_prepare_commit: transaction error pending
[Tue Nov 30 16:39:49 2010 EST,
1 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: ltdb:
tdb(/opt/ad/samba4/private/sam.ldb.d/CN=SCHEMA,CN=CONFIGURATION,DC=AD,DC=MORMAIL,DC=COM.ldb): tdb_transaction_cancel: no transaction
[Tue Nov 30 16:39:49 2010 EST,
0 ../lib/ldb-samba/ldb_wrap.c:68:ldb_wrap_debug()]
ldb: A transaction is still active in ldb context [0x3488270]
on /opt/ad/samba4/private/sam.ldb