http://help.sap.com/download/ibp/ibp50_sp02_model_conf.pdf
In this model config guide, you'll find by searching for "Alert" that there is a global parameter you can set (limits number of alerts that are displayed), but you dont need to
Plus, in the online help you'll find under http://help.sap.com/saphelp_ibp50/helpdata/en/f8/d4745450c0b924e10000000a4c4043/content.htm?frameset=/en/df/2d72540d52ba24e10000000a4c4043/frameset.htm¤t_toc=/en/34/234454dafe8b24e10000000a4450e5/plain.htm&node_id=87&show_children=false
a description of how to use alerts in web ui
Yours Irmi