I guess you have made some customization ,, is it so ?? if yes then try to block it for a while and then try the process if it still persist then it's an issue otherwise u just let us know what exactly have u done ...
Problem are not rights, but wrong trigger used for some action. Use debugger to see where the error raise and you will see that it is some customization...
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as i m given a Read & Excute and Read permission on the Windows only.
Can this be one of the issue?
Hope we can help you better ..
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but it is weird that one of my administrator's ID got no problem of doing it.
moreover the error message only pop up when the Sales Order Line is more than 2-3
i'll try to check on the customization..