ambiguous?

ok, im trying to create this query

Code Snippet

select distinct j.eventid
from oppositeleptons j
where dbo.invmass(j.l1Ee,j.l2Ee,j.l1px,j.l2px,j.l1py,
j.l2py,j.l1pz,j.l2pz,91.1882)<10;

GO

and it throw me this error message

Msg 4121, Level 16, State 1, Procedure EvInvMass, Line 3
Cannot find either column "dbo" or the user-defined function or aggregate "dbo.invmass", or the name is ambiguous.

the fact is.... theres no DBO column in oppositeleptons, so why this ambiguity?
the problem is that the function "dbo.invmass" does not exist

Check the owner of the function.. it needs to be called as
<owner>.invmass
where <owner> usually is dbo but it depends who created it and how.