ContributionsMost RecentMost LikesSolutionsRe: Error: Unable to get property 'prototype' of undefined or null reference Hi, I'm facing the same error when login Myob AccountRight desktop. The error prompted after I entered a valid email and click on "Next". However, if I entered an invalid email (which does't exists), it's prompt me to enter password without prompted the "Unable to get property 'prototype' of undefined or null reference" error. I've tried out all the steps that you provided. However, the issue still persist. Kindly please help on that. Thanks in advance. Re: Cannot Add negative line when creating sales Invoice HiYanike, I am working on MYOB Essential Online Version and inserting inovice by calling API. I know we can do in the Desktop Version also can add Netgative in MYOB Account manually but not when using online vesrion. Thanks Heena Re: Cannot Add negative line when creating sales Invoice Hi, All our customers are Car Panel shop owners and they have invoices which includes excess amount. However, excess amount are deducted from the tax invoice before GST. So, is there any way we can deduct that excess amount from the invoice by adding negative line item? Please find the attachment which showcases the scenario. Cannot Add negative line when creating sales Invoice we are implementing MYOB export Online version in our software in which I have to add negative line for excess in the sales inovice but I am getting Bad request error. Well I have checked Validation error and warning message and got to know that its expected message when you add negative amount. But, I am not sure how do I handle this senariao when I need to add negative line please advice thanks. Solved