TAC and I found a bug, CSCum05301.
May be that is also helpfull for others.
https://tools.cisco.com/bugsearch/bug/CSCum05301/
Symptom:
Inventory collection will fail if following keywords are used as part on description command on the interface config level of IOS device: 1Gbps, 10Mbps etc.
Following error message is visible on the DWC:
Inventory Collection Status: Partial Collection Failure
Collection Status Failed feature(s)
Unable to configure DSL, Serial, POS, Ethernet, Loopback, Virtual-Interface, Tunnel, Vlan, Switchport and Service Module interfaces on ISR, ASR and Switches.
Conditions:
Speed keywords like 1Gbps, 10Mbps etc. available as part of descrption command in IOS interface level.
For example:
interface FastEthernet0/3
description 10Mbps
Workaround:
Use a space character between number and unit keyword, like 1 Gbps.