These instructions will guide you through creating a Data Synchronization Integration Scenario, which will allow you to transfer data from SAP (or other systems) to Salesforce, so the values can be replicated onto Salesforce records.
1. Under Integration Scenarios tab (1), Select New (2).
2. Select Data Synchronization, then Next.
3. In the New Scenario record, enter a Scenario Name (must be API name) (1) and choose your Connection String (2) from the lookup list. Description (3) is optional. Select Next (4). In this example, we are going to replicate customer master data.
4. After landing on the Scenario Edit page, go to the SAP System Info section and choose the correct option for your integration. In this example, select SAP Table (1) and then select the Search button (2). 
A new window will pop up. Enter "KNA1", the master customer data table in SAP, in the Search Filter (1) and select Search (2). Select "KNA1" from the search results (3)
The chosen table name will appear (1). Select Choose fields link in order to select the fields to be replicated.
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5. Unselect the top box to deselect all of the fields (1) and select the fields you wish to be replicated (2). In this example, we chose KUNNR (Account Number), LAND1 (Country), NAME1 (Name), ORT01 (City), PSTLZ (Postal Code), STRAS (Street/House), TELF1 (Phone), and TELFX (Fax). Make sure KUNNR (Account Number) is selected as Overcast will use this as the identifying field for the record. Select Save (3).
6. Once you are navigated back to the Scenario page, you will see your selected fields displayed. Select Save & Activate.
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Next, you will continue to Create an Object mapping record that will allow you to match fields from SAP (or another system) to Salesforce fields.