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I may be dumb on this ! still I want to know ? Why its happening ?
> Bottle1 replaced by alpha1
> and length of filter is 3 at first filter log

you pushed the same array into the filters twice

When you modify the source object it will change on array too because it's same object... you need to clone it to modify just one

I was expecting  [["itemid", "is", "Bottle1"], "OR",["itemid", "is", "alpha2"]] as last filter log

you pushed in the same array object twice

the first element and the second of the element of filter is the same object: array

try change the second "push(array);" to "push(JSON.parse(JSON.stringify(array)));"

In some languages when you add an object into an array it create a copy of this object into this array but in JS it still linked to source object so any changes on source will affect the objects inside the array

<@UK31HJ2VD> solution will push in a new array, but you still modified the first one, so your log will show the changes you made to the first one

im not sure what you are trying to do, but you shouldnt be trying to reuse arrays as filters

make a new one for each search filter you want to represent

I guess he wants to add multiple item ids as filter

```var filter = [["itemid", "is", "Bottle1"], "OR", ["itemid", "is", "alpha2"]];```

I don't think you need to create a template array before push... you could just push new array with item id like:
push(["itemid","is", anyVariable]);

if you wanted something that is more obvious to use in a loop, use:
```var filter = [['itemid', 'is', 'Bottle1']]
filter.push('OR', ['itemid', 'is', 'alpha2'])```

keep in mind that a formula using the IN condition might also work

<https://netsuiteprofessionals.slack.com/archives/C29HQS63G/p1586976714055600>

beware, for item searches, itemid refers to all the names of the item, including vendor name and display name