Employee details not replicated in Sales Oredr from crm to r/3

Dear Experts,

There is an error related to the sales order modification in
CRM to ECC(R/3).

While creating the SO liaison employee and sales employee is
given and it’s replicated properly in R/3.

Modify the same  sales
order for e.g.-quantity, delivery date, value the changes gets updated in sales
order perfectly in CRM as well as in ECC , but the details of liaison employee
and sales employee gets deleted from the partner tab in sales order .while
checking the change log its shows deleted.

Modification made in the same sales order for 2^nd
time for e.g.-quantity, delivery date,
value the changes gets updated in sales order perfectly in CRM as well as in
ECC  and the details of liaison employee
and sales employee replicated perfectly in partner tab of  sales order.

Kindly advice.

Regards,

shachi