Found a problem relevant to creating by copy Customer using XD01. After extending Co. Code & Sales Area Data for the same Customer with ref. to another Co. Code & Sales Area, found that info. of a field "Prev.acct no. (Previous Master Record Number)" under "Co. Code Data - Account Mgt - Reference data", and Partners under "Partner Functions" of Sales Area Data could NOT be copied. Is it a standard SAP logic ? Could you advise reason for this ? Besides these, any other field(s) also CANNOT be copied after creating by copy Customer ?