Lookup field value Overwritten Original value

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Posted on by sandeepc

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unexpected error

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Dynamics 365 general

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sandeepc 5,514 on at

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André Arnaud de Cal... 301,618 Super User 2025 Season 2 on at

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Hi Sandeep,

Can you tell us what Dynamics 365 application this question is related to? There are several different solutions in the Dynamics 365 family, like: Sales, Finance, Supply Chain Management, Project Operations, and Business Central.

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sandeepc 5,514 on at

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Sales @andre

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Jeevarajan Kumar 781 Most Valuable Professional on at

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Hi Sandeep,

Few things, by the looks of it, itseems that lookup field_2 is a polymorphic lookup field.
Step1: Make sure that it's multi entity polymorphic field since you cannot set a "concatenated" value into a single lookup polymorphic field.
Step 2: it seems there are few issues in the code. 1. dont do JSON parse, use the object directly. 2. Don't use Split, its not a string as its an object. 3. Key issue here is the concat, try something like this rather

// Merge and remove duplicates const merged = [...lookup field_2]; lookup field_3.forEach(item => { if (!merged.some(existing => existing.id === item.id && existing.entityType === (item.entityType || item.logicalName))) { merged.push({ id: item.id, name: item.name, entityType: item.entityType || item.logicalName }); } }); formContext.getAttribute("lookupfield_2").setValue(merged);

Please mark my answer as Yes if it helps!

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