# About the pair to active/passive selection set numbers

**URL:** <https://ask.bioexcel.eu/t/about-the-pair-to-active-passive-selection-set-numbers/5769>\
**Category:** HADDOCK\
**Tags:** haddock, support, tutorials\
**Created:** [June 25, 2025, 4:31am UTC](https://ask.bioexcel.eu/t/about-the-pair-to-active-passive-selection-set-numbers/5769 "2025-06-25T04:31:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![yashika](https://avatars.discourse-cdn.com/v4/letter/y/4da419/32.png) [@yashika](https://ask.bioexcel.eu/u/yashika)\
**Post date:** [June 25, 2025, 4:31am UTC](https://ask.bioexcel.eu/t/about-the-pair-to-active-passive-selection-set-numbers/5769/1 "2025-06-25T04:31:38Z")

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I want to dock 2 siRNAs with single protein one at position near 184 and other near 440 but in active/passive selection set numbers box i am facing problem. In pair to active/passive selection set number box of molecule 2 i write 1 after clicking on next next red box appear to this and saying partner 4 not found. How to solve this

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**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\
**Post date:** [August 12, 2025, 1:07pm UTC](https://ask.bioexcel.eu/t/about-the-pair-to-active-passive-selection-set-numbers/5769/2 "2025-08-12T13:07:56Z")

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Did you solve this issue? If not provide the exact input/actions you are doing on the server page.