E1 and BRI VWICs on same router??

HI There,

running a 1760 CCME to PSTN via Bri (IOS 12.3(14)T5) Just got an E1 VIC to do a trunk to a mitel PBX (3300) using QSIG

However I can seem to configure the timeslots, it seems to require the "tdm clock e1 0/0 both export line" but when entered I get "% exceed the max 1 clock source limit" when I issue the commands.

Is this because I have "TDM clock bri-auto" already?

How do I get both working?

THANKS!!!

Peter.