You do not write correct the search options.

Replace

searchOptions <= Bad

with

searchoptions

JavaScript is case sensitive. Please before to post consult the docs on how to write the correct names

Regards

for each field I put different search options :

.....colModel: [
{ name: 'UserName' ,.....,searchOptions:{sopt['bw','bn']}.......
},
name:'Amount' ,......searchOptions:{sopt['eq','ne']}......

when I select a field on the multiplesearch window , the searchoptions on the dropdown list are shown ,but when I select another field , the search options not shown ok : I see the previous searchoptions and only if I press the 'reset' button and select again that field, only than I can see the correct searchoptions .