The question is what the suggestion will be. Renaming the table field is impossible, because the requested label depends on data context, while a field label is fixed when defining the field.
In this case, we're talking about personalization, therefore the requirement could be "When adding a data source field to a form via personalization, I want to change the label to a custom value". But it's not as simple as saying that I want to rename Unit from Invent module parameters (2) to Inventory unit, because it wouldn't cover translation to other languages. You could either use a label defined by developers or are the user to provide translation to all languages used by the company. It's all possible to do, but it's not as simply as saying that Microsoft should rename a field.
All right, it's not a customization; it's your own personalization. But the question about the source of data is still relevant. In fact, understanding where the fields come from can answer your question.
You've apparently added these three fields:
Notice that they come from the same table (Inventory module parameters). Therefore it's a single field; the data you see just come from different records of Inventory module parameters table. The field is called Unit; whether it's a purchase, sales or inventory unit depends on other data (namely InventTableModule.ModuleType field).
In your case, you should use a customization to create form controls mapped to these fields and change field label to labels you want in the context where you're using these three instances of InventTableModule.UnitId field.
Moved from D365 general forum to D365 Finance forum, because it seems to be about F&O and not about D365 in general.
What is the source of these fields? Isn't it a customization where a developer displayed units from default order settings but didn't set the labels that you suggest? If so, you need to get your customization fixed.
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