Hi good day!
Im new in this forum, Currently working on a project using erpnext, To make a certain task more efficient changing a field type to mandatory or to read only after selecting an option from a drop down field would be a very effective way to avoid wrong input errors. Looking forward for your help. Thank you.
Nikko Z.
Hi @NikzurNext,
You will need t o write the trigger on select field and compare the option values, then accordingt to your requirement you can change the fields property using following methods in client script
cur_frm.toggle_display("fieldname", true)
to hide or unhide field
cur_frm.toggle_enable("fieldname", true)
to make field readonly or editable
cur_frm.toggle_reqd("fieldname", true)
to make field madantory
Thanks, Makarand
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Hello @makarand_b
Thank you so much. I’ll try to apply this and post here the result. Highly appreciated. Thanks. 
Hi @makarand_b,
The code worked smoothly. By setting the default to mandatory the code worked more efficient.
Thank you.
My regards,
Nikko Z.