<s>
This	O
architectural	O
abstraction	O
is	O
made	O
necessary	O
due	O
to	O
functional	O
logic	O
abstraction	O
,	O
which	O
is	O
the	O
capability	O
of	O
separating	O
business	B-Architecture
logic	I-Architecture
implementation	O
code	O
from	O
the	O
service	O
protocol	O
implementation	O
calling	O
it	O
.	O
</s>
<s>
The	O
fact	O
that	O
business	B-Architecture
logic	I-Architecture
implementations	O
(	O
operations	O
)	O
may	O
be	O
implemented	O
in	O
synchronous	O
or	O
asynchronous	O
manners	O
and	O
that	O
these	O
business	B-Architecture
logic	I-Architecture
implementations	O
may	O
be	O
interchangeable	O
can	O
cause	O
problems	O
when	O
not	O
addressed	O
.	O
</s>
