Hi,
Is it possible to try this:
Import the dependent MIBs in the MIBImport utility's MIB Repository (VMWARE-ROOT-MIB, VMWARE-TC-MIB, VMWARE-PRODUCTS-MIB, VMWARE-ENV-MIB). Once these are part of the MIB Repository, you should be able to parse the VMWARE-CIMOM-MIB which contains this heartbeat trap.
If parsing works, then you should be able to import it in the OME.
Note: Please do not try parsing the dependent MIBs as it will block you with the message which you are seeing now.
Regards,