You will need to Create an Object Mapping record to use for your Data Synchronization. This allows you to match SAP fields to Salesforce fields, so the data is mapped correctly when being utilized in Salesforce.
1. On the Data Synchronization Integration Scenario, under the Object Mapping section, select New Object Mapping
.
2. Enter a name in the field Mapping Name (as an API Name) (1). Select the Source Object from the drop down (in the format of Scenario Name + Table Name) (2). Select the Salesforce Target Object in the drop down (3). In this example, it should be "Account". Once you have populated the record, select Load Lists (4).

3. Drag and Drop the fields on the left (SAP Table) into the column on the right, under the correctly associated Salesforce field. KUNNR__c(STRING) has to be paired with AccountNumber(STRING).

Use the Search bar under each column to better narrow down your results in finding the fields.
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You can map one SAP field to up to two Salesforce fields.

4. In Assign Target Foreign Key Field, select "Account Number". Overcast will use this as the identifying field for the record. Select Save.

5. Once you are done mapping, go back in your browser to the Scenario page.
Refresh your Data Synchronization Integration Scenario, and you will see the Object Mapping record you just created.

Next, you will continue to set up a new Query Predicate.