How to update a map
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To display the data type for a dropped or added column, hover the cursor over the column name in Dropped Columns or Added Columns.
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For renamed columns, drag the old column name from Dropped Columns to Old Column Name. Then drag the new column name from Added Columns to New Column Name. For columns whose data type has changed, the Old Column Name may be the same as the New Column Name. To remove a renamed column pair, choose Remove.
In Figure 2-27, the name of the customerID column has changed to customerNumber. The data type of the creditLimit column has changed from Decimal to Double.
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To remove dropped columns from dependent information objects, select Propagate dropped column changes to dependent files. If the warning shown in Figure 2-28 appears, choose OK.
Figure 2-27  
Figure 2-28  
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Because these changes cannot be undone, review them carefully. If the changes are acceptable, choose Finish. If not, choose Back and make the necessary corrections. Figure 2-29 shows a summary of changes for the Customers map and its dependent information object, MyInformationObject.
Figure 2-29  

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