Question

How to remove items from the Repeating Group? 

Answer

The following script demonstrates the removal of all items from the repeating group except the first one:

if (Document.HasField("SectionName\\RepeatingGroupName"))
{​​​​​​
            while (Document.Field("SectionName\\RepeatingGroupName").Items.Count>1)
        {​​​​​​
                int itemsCount = Document.Field("SectionName\\RepeatingGroupName").Items.Count;
                Document.Field("SectionName\\RepeatingGroupName").Items.Delete(itemsCount-1);
        }​​​​​​
 }​​​​​​

Note: the script is only for demonstration purposes and needs to be modified in accordance with the desired workflow. 

See also: 

• How to resolve the issue with Duplicates in PO
• LineItems Removing Script