Installed Base field is disabled in ZMCR

Hi All,

We are using Solution Manager 7.1 SP 07 and configuring ChaRM. When using ZMCR for Request for change which is a copy of SMCR, the field "Installed Base" under the section "Request for Change Scope" seems to be totally disabled and is not editable at all.

Is there any specific reason because of which this can occur?

Many thanks for your responses.

Regards,

SAP Basis Admin