Structures are virtual tables defined in the SAP dictionary. You can create a structure variable and a structure field variable.
When you create a structure variable, the Designer generates a data statement in the ABAP program to declare the variable. For example, you create a structure variable named struc1 to represent an SAP structure called AENVS. The Designer generates the following statement in the ABAP program to declare struc1:
data: struc1 like AENVS occurs 5 with header line.
The structure AENVS has a field called EXIST. You can create a structure field variable called field1 to represent this field. The Designer generates the following statement in the ABAP program to declare field1:
data: FIELD1 like AENVS-EXIST.
After you create the structure field variable, you specify its initial value in an ABAP code block.