Update EHP1 to Netweaver PI 7.3 (JAVA ONLY) issue

Hi experts,

I am trying to update EHP1 to Netweaver PI 7.3 (Advanced Adapter Engine Extnd) following the upgrade guide.

Following activities has been finished as in the guide:

1. SOLMAN Basic Configuration w/ TX SOLMAN_SETUP

2. Correctly registered NW PI 7.3 (AEX) to the SLD of solution manager.

3. Completely transfer the system data from SLD to SMSY.

4. Correctly model the system landscape using SAP Landscape Verification Wizard (LV).

Now, when I am working in TX SOLMAN_WORKCENTER to download the software packages, I can not choose

'EHP1 for Netweaver 7.3' in step 2.1  as u2018Target enhancement package product versionu2019.

Because there is not this option, But only with 'Netweaver 7.3'.

So there is no way for me to download the required software for updating EHP1 to NW 7.3.

Solution manager version is:

SAP EHP 1 for SAP Solution Manager 7.0 with SPS 25

         ST           400              0025

         ST-ICO  150_700     0031

         ST-LV     100              0002

Netweaver PI version is:

SAP Netweaver PI 7.3 (Advanced Adapter Engine Extnd) SPS05

Please HELP!

Thanks in advance!