Final answer:
The statement about one-for-one checking in the OE/S process being a control plan to simplify data entry and reduce errors is true. This method helps prevent omissions and incorrect data formatting.
Step-by-step explanation:
One-for-one checking in the Order Entry/Sales (OE/S) process is indeed a control plan designed to simplify the data entry process and enhance accuracy. By verifying each piece of data as it is entered, one-for-one checking can help in preventing omissions of necessary fields, as well as the entry of data in incorrect formats. Therefore, the statement is true. This technique plays a crucial role in ensuring the integrity of data entry, reducing input errors, and ultimately improving the quality of customer service.