# Rule Engine Node

**URL:** <https://forum.knime.com/t/rule-engine-node/25592>\
**Category:** KNIME Analytics Platform\
**Created:** [July 31, 2020, 7:09pm UTC](https://forum.knime.com/t/rule-engine-node/25592 "2020-07-31T19:09:24Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jutta1971](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/j/cab0a1/32.png) [@Jutta1971](https://forum.knime.com/u/Jutta1971)\
**Post date:** [July 31, 2020, 7:09pm UTC](https://forum.knime.com/t/rule-engine-node/25592/1 "2020-07-31T19:09:24Z")

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![2020-07-31 (5)](https://forum-cdn.knime.com/uploads/default/original/3X/0/e/0e05ab034ff3b5d1556c1c3b016d4f7f624b33ac.png)

Hello, does anyone know how to solve this problem?  
Thank you!

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**Author:** ![sahil786](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/s/e480ec/32.png) [@sahil786](https://forum.knime.com/u/sahil786)\
**Post date:** [July 31, 2020, 7:25pm UTC](https://forum.knime.com/t/rule-engine-node/25592/2 "2020-07-31T19:25:24Z")

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It seems ur flow variable(currentiteration) is integer and rule engine require string as an input

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**Author:** ![armingrudd](https://forum-cdn.knime.com/user_avatar/forum.knime.com/armingrudd/32/84633_2.png) [@armingrudd](https://forum.knime.com/u/armingrudd)\
**Post date:** [July 31, 2020, 7:33pm UTC](https://forum.knime.com/t/rule-engine-node/25592/3 "2020-07-31T19:33:00Z")

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Hi @Jutta1971,

You can use if() function in the [Math Formula](https://nodepit.com/node/org.knime.ext.jep.JEPNodeFactory) node instead.

😊

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**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\
**Post date:** [January 30, 2021, 7:33am UTC](https://forum.knime.com/t/rule-engine-node/25592/4 "2021-01-30T07:33:43Z")

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