Hi Ludwig Reinhard,
thanks for you answers.
In fact I should explain more 'business requirement'. Currently company starts project and doesn't know if and (if yes) who shall be invoiced. Therefore company needs a solution allowing registration of hours and expenses (as for today) and - after some time (it could be even months) - decide to whom invoice the project. As long as customer is unknown - company wants to avoid invoicing 'by mistake' - therefore expects to have functionality of invoicing blocked. Additionally company created the rule of numbering projects and doesn't like to have two projects created in AX for the same business project (what excludes an idea of two projects and adjustment of transactions transferring them between projects).
Based on assumptions above - I tried the following procedure ( as I found only one way to change project type - by changing Project Group):
1. Start project as 'Internal' - keeping cost of hours and expenses and not allowing invoicing;
2. When customer is known - change (somehow) type of project to 'Time & Material' - keeping the same project ID;
3. Assign Project Contract including known customer(s);
4. Invoicing converted project to customer(s) from Project Contract.
As I wrote - I posted transactions for 'Internal' project with property ALLOWING INVOICING. 'Nonchargeable' status for transaction is defined - because RecId of Funding Source from Project Contract (defined when Project Group was changed) is NOT stored on all tables storing project transactions but only of few of them :(. Therefore I think that it could be a bug (not propagating RecID of Funding Sources to all related transaction tables).
I don't have to use 'my' procedure - any advise how to fulfill company requirements is kindly appreciated :)
With regards
Witold