Operations on individual elements of the list and groups. The real challenge ...

A similar topic has already been discussed . Although this task is slightly different. It is necessary to place not the buttons, but ... However, let’s order.


So, we have a list of some entities. Each entity has two accounts and some constant.
What is needed:
1. for each entity, show the account balance and constant.
2. give the opportunity to change the value of the constant.
3. to enable the transfer of funds from one account to another (in two directions)

Here, strictly speaking, that's all. Naturally, we must give the opportunity to carry out such operations on individual entities as well as on a group.
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Here is what happened:
List


Operations on individual records
The user brings the cursor to the line. The line is highlighted. form appears on the right. You can change the value of a constant or, by choosing a direction, transfer funds from one account to another.

To make it clearer, I did a little animation .

Group Operations
After the user has marked at least one entry, the logic described above stops working. Ie pointing the cursor on the record does not lead to the appearance of a new form for working with this record. Instead, a form appears on the right to perform operations on a group of selected entries.


While writing this, I thought that for greater clarity, the background color of the marked lines and the background of the form should differ significantly from the background color that will be used for operations on a single element.

I would like to hear your opinion. Do you think this option has the right to life? Perhaps there are some other options or is it worth making some changes?