Hello Nitin,
Looks like there was some problem during customizing download of object DNL_CUST_CNDALL,
because of which key fields were not transferred and also table /1CN/CLICUS501 is not active in
CRM.
Can you please check the logs in transaction SLG1 with below details:
Object : COND_EXCHANGE
Subobject: CUSTOMIZING
Change the From/To date to the actual date of customizing download (you can get it from transaction
R3AM1).
Logs might give some clue related to transferring of key fields of newly created table to CRM.
If key fields are transferred correctly in table /SAPCND/T681E and table is active in CRM,
then object download for G501 should not create any problems.
Hope this helps!
Best Regards,
Shanthala.