Write Statement

Hi,

How to use subtract or add operations in write statment.

For example, I want to subtract qty released - qty completed to arrive qty pending, If I execute below code I am getting error.

SELECT * FROM afpo.

WRITE :/ afpo-pgmng - afpo-wemng.

ENDSELECT.

Please guide me.

Regards & Thanks,

BV

ABAP Beginner.