Vendors: Copying Changes to Purchasing Data to Other Data Records 
Use
Purchasing data is stored in the vendor master. When you create articles in the article master and in the relevant purchasing info records, the system can propose purchasing data from the vendor master as default data. When you make changes to purchasing data in the vendor master, and if certain conditions are met, the system copies the changes to existing article master records and purchasing info records.
Prerequisites
The following factors determine whether values in fields in the article master or in purchasing info records are affected by your changes to vendor master data:
In the activity
General Control, Retail Master Data, you can specify the following:
In the activity
Define Account Groups and Field Selection for Vendors, you can specify whether changed vendor master data is to be:

Your settings in Basic Data Retail for the copying of vendor master data to article master records take precedence over your settings in Business Partners.
Your settings in Basic Data Retail do not affect your settings in Business Partners for the copying of vendor master data to purchasing info records.
Setting in Customizing for Basic Data Retail |
Setting in Customizing for Business Partners |
Result |
No copying of vendor master data |
Copy only to article master records |
Vendor master data is not copied to article master records |
No copying of vendor master data |
Copy to both purchasing info records and article master records |
Vendor master data is copied to purchasing info records only |

If you choose to have vendor master data proposed or copied to article master records, the R/3 System determines a source of supply from which the data is proposed or copied. If you do not want to work with default data, choose the setting Do not propose or copy material data from vendor master in Customizing for Basic Data Retail to increase system performance.
See Vendors: Determining the Relevant Purchasing Info Records
See Vendors: Determining the Relevant Article Master Records
If you choose the setting Copy to both purchasing info records and article master records in Customizing for Business Partners, an unsuccessful block on a purchasing info record prevents a change being made to an article master record which you have successfully blocked (if the field in which the change is made occurs in both records). This applies likewise to an unsuccessful block in the article master.
Because the automatic update of all changes can involve a very large amount of data, the process may take some time.