Internal session terminated with a runtime error (see ST22)

Hi

I am getting following error

Internal session terminated with a runtime error (see ST22)

when i am using a BAPI to change a purchase order => BAPI_PO_CHANGE

The dump analysis is :-

What happened?
The current ABAP/4 program encountered an unexpected
situation.

What can you do?
Note down which actions and inputs caused the error.

To process the problem further, contact you SAP system
administrator.

Using Transaction ST22 for ABAP Dump Analysis, you can look
at and manage termination messages, and you can also
keep them for a long time.

Error analysis
A RAISE statement in the program "SAPLMEDCMM" raised the exception
condition "FAILED".
Since the exception was not intercepted by a superior
program, processing was terminated.

Short description of exception condition:

For detailed documentation of the exception condition, use
Transaction SE37 (Function Library). You can take the called
function module from the display of active calls.

Information on where terminated
Termination occurred in the ABAP program "SAPLMEDCMM" - in
"IF_REVISION_MANAGER_DCM~COMPLETE_ITEM".
The main program was "ZPO_MAIL_NEW ".

In the source code you have the termination point in line 364
of the (Include) program "LMEDCMMF01".
The program "SAPLMEDCMM" was started as a background job.
Job Name....... "ZPO_MAIL_NEW"
Job Initiator.. "MTCSMM1"
Job Number..... 17492900

Please find the attached file for more details.