SP06: The specified regulu00F6ar expression "([^%]*)%(..)(.*)" is too complex

Hi,

after upgrading from SRM7.0 SP04 to SP06 we get the following error, when we transfer items from mdm back to srm:

Error in the ABAP Application Program                                                                                
The current ABAP program "/SAPSRM/CL_CH_WD_INBOUND_HDLR=CP" had to be           
 terminated because it has                                                      
come across a statement that unfortunately cannot be executed.                                                                                
The specified regulöar expression "([^%]*)%(..)(.*)" is too complex. Therefore, 
 it is                                                                          
not possible to determine the matches in the search text accroding to           
the leftmost-longest rule.                                                      

Any ideas?

Thanks and best regards,

Roman