ABAP Code enhance to hide show data in BEx query.

Dear Expert,

I have a complex requirement from customer for hiding row in BEx report. If I use only function in Bex Query I can not meet this requirement.

Please tell me what ABAP enhance in Bex and give me an example to do this.

My sceranio is:

                      Reobject                                                          Contract

For this data of ROCD01_1_255 , I want to hide CTR_NONE in the second row beacuse this characteristic value is <> CD01*. For each Reobject char value has only CTR_NONE is still show. It's only hide if a Reobject has 2 Contract.

please help me.

thanks so much