Thanks for your prompt reply of my question.
Unfortunately I do not have any version of SQL server installed on my PC. Also, I have no experience about working with that developer tool. So, I think it will take me hours to use the coding approach.
Furthermore, I use the openLCA v.1.4 for self-education purpose, when I find myself experienced enough - then I’ll change my computer by a more powerful one and go to version 1.5 or maybe the newest v.1.6 .
Until then, I consider creating a new process which is not linked to the hidden product system that troubled me. The new process will permit me to create a new product system and thus to continue my current (dummy) project work. I think such an indirect approach may be helpful.