SAP Message AD147 - Table & is reference table in &-&

Diagnosis
The table you wish to delete is used as a reference table in thespecified table field. The table is given as a reference in the tablefield of type CURR or QUAN. This means that the table may not bedeleted.

System Response
The delete request was rejected.

Procedure
If you still want to delete the table, the reference table must bereplaced by another in the specified table field. Once you have donethis, you will be able to delete the table.