Can't transfer two assingment line at the same time

Hi,

i have an asset with 2 assignment lines, i want to transfer them to another two expense account by inputting:

-1 line A

-1 line B

1 line C

1 line D

But the system prompt error on these. I can only do so by transferring them one by one:

-1 line A

1 line C

(Done)

Then transfer again:

-1 line B

1 line D

Are there any ways to transfer the two lines in one transaction?

Thanks!