[A] If your document is directly "save and send" instead going for approval, even if you have rule added for that document, check the rule that you have added in "Approvals module >> Settings".

[B] Search for the rule you have added and check the lower bound & upper bound of the rule. 

[C] Cross check it with the amount of the document, if the document amount is not within the upper & lower bound then document will be directly "save and send".

[D] In this case you will have to delete the previous rule and add new rule with greater upper limit. 

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