# Cannot set multiplicity for a pin in an activity diagram

**URL:** <https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137>\
**Category:** UML\
**Created:** [November 26, 2021, 6:23am UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137 "2021-11-26T06:23:22Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Zsolt\_Sandor](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/zsolt_sandor/32/5002_2.png) [@Zsolt\_Sandor](https://forums.visual-paradigm.com/u/Zsolt_Sandor)\
**Post date:** [November 26, 2021, 6:23am UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/1 "2021-11-26T06:23:22Z")

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Based on the OMG specification a pin in an activity diagram is a multiplicity element, therefore it would be nice to be able to specify the multiplicity for a pin.

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**Author:** ![Jick](https://avatars.discourse-cdn.com/v2/letter/j/ea666f/32.png) [@Jick](https://forums.visual-paradigm.com/u/Jick)\
**Post date:** [November 29, 2021, 12:46pm UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/2 "2021-11-29T12:46:13Z")

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Dear Zsolt,

Thank you for your post. I’ve asked our development team to have a look at the OMG UML specification to see if we should support multiplicity for pins. When there is any news, I will let you know.

Best regards,  
Jick Yeung

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**Author:** ![Zsolt\_Sandor](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/zsolt_sandor/32/5002_2.png) [@Zsolt\_Sandor](https://forums.visual-paradigm.com/u/Zsolt_Sandor)\
**Post date:** [November 29, 2021, 3:12pm UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/3 "2021-11-29T15:12:46Z")

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Hello Jick, thank you so much for the quick answer. Based on the OMG UML 2.5.1 standard

16.14.33 Pin [Abstract Class]  
16.14.33.1 Description  
A Pin is an ObjectNode and **MultiplicityElement** that provides input values to an Action or accepts output values from an Action.

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**Author:** ![Jick](https://avatars.discourse-cdn.com/v2/letter/j/ea666f/32.png) [@Jick](https://forums.visual-paradigm.com/u/Jick)\
**Post date:** [November 30, 2021, 8:41am UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/4 "2021-11-30T08:41:23Z")

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Hi Zsolt,

You are right. We will support it in the coming version. Thanks for letting us know. I will post again when it’s out.

Best regards,  
Jick Yeung

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**Author:** ![Zsolt\_Sandor](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/zsolt_sandor/32/5002_2.png) [@Zsolt\_Sandor](https://forums.visual-paradigm.com/u/Zsolt_Sandor)\
**Post date:** [November 30, 2021, 11:48am UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/5 "2021-11-30T11:48:26Z")

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Awesome, thank you so much!

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<div class="post-metadata">

**Author:** ![Jick](https://avatars.discourse-cdn.com/v2/letter/j/ea666f/32.png) [@Jick](https://forums.visual-paradigm.com/u/Jick)\
**Post date:** [December 6, 2021, 10:53am UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/6 "2021-12-06T10:53:25Z")

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You’re welcome! 🙂

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<div class="post-metadata">

**Author:** ![Zsolt\_Sandor](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/zsolt_sandor/32/5002_2.png) [@Zsolt\_Sandor](https://forums.visual-paradigm.com/u/Zsolt_Sandor)\
**Post date:** [November 18, 2022, 8:24pm UTC](https://forums.visual-paradigm.com/t/cannot-set-multiplicity-for-a-pin-in-an-activity-diagram/17137/7 "2022-11-18T20:24:04Z")

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Hello, is this function implemented?