Custom transaction type going for dump

Hello Gurus,

We had a requirement to deal with oppt, lead, quotation. So we created custom transaction types by coping the standard one.

When we are using the custom transaction types in GUI using CRMD_ORDER it is going for dump, once we assign products or partners involved either of them.

Here are the dump details...

condition "TYPE_NOT_FOUND".

Program                                 CL_ABAP_TYPEDESCR=============CP

Include                                 CL_ABAP_TYPEDESCR=============CM001

Row                                     83 ( raise type_not_found )

Module type                         (METHOD)

Module Name                       DESCRIBE_BY_NAME

Please help me out to solve the issue...

Regards,

Magana