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I have a field in production number_of_requests__c type Number (18, 0), the entered data is copied (on save) to another field number_of_case__c type Number (6, 0) of another related object.

In the main object I have another field "rollup" that sums all the values ​​contained in the number_of_case__c (field of the object related). A user is trying to put the value 1000000 in number_of_requests__c and the system returns the error NUMBER_OUTSIDE_VALID_RANGE.

Can I change the number_of_case field type from Number (6, 0) to Number (18, 0) without losing data?

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Yes, you can increase the length without losing the data. You might get a warning but you can ignore that.

If you are still concerned then you can export that data in a CSV file and later you can upload those records in case if you find that you did lose some data.

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  • I can't reload data. This is thought worry – Pericle Parquet Oct 10 '18 at 8:46
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    If you are increasing the size then it won't affect. You may lose the data if you're narrowing the field content length. In your case, you are good to go since 6 < 18. – Naval Sharma Oct 10 '18 at 9:06

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