In Workday Adaptive Planning, Accounts are the single required element to create a modeled sheet. A modeled sheet must have at least one account defined to represent the data being planned - accounts serve as the columns in a modeled sheet, capturing the various values for each row (record). Without an account, a modeled sheet has no data structure and cannot be created or saved. Dimensions are commonly used in modeled sheets to enable dimensional data entry and classification, but they are optional - a basic modeled sheet can function with accounts alone. Levels are not a creation requirement for modeled sheets; the sheet applies to levels through its assignment configuration, not as a creation prerequisite. Attributes are metadata elements used for filtering and grouping but are not required for sheet creation. The account is the foundational element of any Adaptive Planning sheet type - it represents what is being measured or planned. In the context of modeled sheets, accounts define the column structure of each planning row. Reference: Workday Adaptive Planning - Modeled Sheet Creation, Required Elements, Sheet Architecture.