The SQL statement generated from SAP Open SQL violates a               
restriction imposed by the database system used in R/3.               
-                                                                     
For details, refer to either the system log or the developer trace.   
Possible reasons for error:                                           
o Maximum size of an SQL statement exceeded.                         
o The statement contains too many input variables.                   
o The input data requires more space than is available.               
o ...                                                                 
You can usually find details in the system log (SM21) and in           
the developer trace of the relevant work process (ST11).               
In the event of an error, the developer trace often gives the         
current restrictions.                                                 

INSERT MARA FROM TABLE MARA_INS ACCEPTING DUPLICATE KEYS.